11 files changed, 384 insertions, 238 deletions
diff --git a/gr-uhd/apps/msgq_runner.py b/gr-uhd/apps/msgq_runner.py
index 31bebcf0df..1fe86f1ad1 100644
--- a/gr-uhd/apps/msgq_runner.py
+++ b/gr-uhd/apps/msgq_runner.py
@@ -32,6 +32,7 @@ To determine if the runner has exited, call exited() on the object.
 from gnuradio import gr
 import threading
 
+
 class msgq_runner(threading.Thread):
 
     def __init__(self, msgq, callback, exit_on_error=False):
diff --git a/gr-uhd/apps/uhd_app.py b/gr-uhd/apps/uhd_app.py
index 65b35ac736..55c2a71d2f 100644
--- a/gr-uhd/apps/uhd_app.py
+++ b/gr-uhd/apps/uhd_app.py
@@ -18,7 +18,7 @@ from gnuradio import eng_arg
 from gnuradio import uhd
 from gnuradio import gr
 
-COMMAND_DELAY = .2 # Seconds
+COMMAND_DELAY = .2  # Seconds
 
 COMPACT_TPL = "{mb_id} ({mb_serial}), {db_subdev} ({subdev}, {ant}{db_serial})"
 LONG_TPL = """{prefix}  Motherboard: {mb_id} ({mb_serial})
@@ -30,11 +30,13 @@ LONG_TPL = """{prefix}  Motherboard: {mb_id} ({mb_serial})
 # PyLint can't reliably detect C++ exports in modules, so let's disable that
 # pylint: disable=no-member
 
+
 class UHDApp:
     GAIN_TYPE_GAIN = 'dB'
     GAIN_TYPE_POWER = 'power_dbm'
 
     " Base class for simple UHD-based applications "
+
     def __init__(self, prefix=None, args=None):
         self.prefix = prefix
         self.args = args
@@ -42,7 +44,7 @@ class UHDApp:
         if self.args.sync == 'auto' and len(self.args.channels) > 1:
             self.args.sync = 'pps'
         self.antenna = None
-        self.gain_range = None # Can also be power range
+        self.gain_range = None  # Can also be power range
         self.samp_rate = None
         self.has_lo_sensor = None
         self.async_msgq = None
@@ -87,8 +89,10 @@ class UHDApp:
             info_pp['mb_serial'] = usrp_info['mboard_serial']
             if info_pp['mb_serial'] == "":
                 info_pp['mb_serial'] = "no serial"
-            info_pp['db_subdev'] = usrp_info["{xx}_subdev_name".format(xx=tx_or_rx)]
-            info_pp['db_serial'] = ", " + usrp_info["{xx}_serial".format(xx=tx_or_rx)]
+            info_pp['db_subdev'] = usrp_info["{xx}_subdev_name".format(
+                xx=tx_or_rx)]
+            info_pp['db_serial'] = ", " + \
+                usrp_info["{xx}_serial".format(xx=tx_or_rx)]
             if info_pp['db_serial'] == "":
                 info_pp['db_serial'] = "no serial"
             info_pp['subdev'] = self.usrp.get_subdev_spec(mboard)
@@ -173,11 +177,13 @@ class UHDApp:
         self.samp_rate = self.usrp.get_samp_rate()
         self.vprint("Using sampling rate: {rate}".format(rate=self.samp_rate))
         # Set the antenna:
-        self.antenna = self.normalize_sel("channels", "antenna", len(args.channels), args.antenna)
+        self.antenna = self.normalize_sel(
+            "channels", "antenna", len(args.channels), args.antenna)
         if self.antenna is not None:
             for i, chan in enumerate(self.channels):
                 if not self.antenna[i] in self.usrp.get_antennas(i):
-                    print("[ERROR] {} is not a valid antenna name for this USRP device!".format(self.antenna[i]))
+                    print("[ERROR] {} is not a valid antenna name for this USRP device!".format(
+                        self.antenna[i]))
                     sys.exit(1)
                 self.usrp.set_antenna(self.antenna[i], i)
                 self.vprint("[{prefix}] Channel {chan}: Using antenna {ant}.".format(
@@ -207,14 +213,16 @@ class UHDApp:
         self.has_lo_sensor = 'lo_locked' in self.usrp.get_sensor_names()
         # Set LO export and LO source operation
         if (args.lo_export is not None) and (args.lo_source is not None):
-            self.lo_source = self.normalize_sel("channels", "lo-source", len(self.channels), args.lo_source)
-            self.lo_export = self.normalize_sel("channels", "lo-export", len(self.channels), args.lo_export)
+            self.lo_source = self.normalize_sel(
+                "channels", "lo-source", len(self.channels), args.lo_source)
+            self.lo_export = self.normalize_sel(
+                "channels", "lo-export", len(self.channels), args.lo_export)
             self.lo_source_channel = None
             for chan, lo_source, lo_export in zip(self.channels, self.lo_source, self.lo_export):
                 if (lo_source == "None") or (lo_export == "None"):
                     continue
                 if lo_export == "True":
-                    #If channel is LO source set frequency and store response
+                    # If channel is LO source set frequency and store response
                     self.usrp.set_lo_export_enabled(True, uhd.ALL_LOS, chan)
                 if lo_source == "internal":
                     self.lo_source_channel = chan
@@ -225,7 +233,7 @@ class UHDApp:
                 if getattr(args, 'lo_offset', None) is not None:
                     treq = uhd.tune_request(
                         target_freq=args.freq,
-                        rf_freq=args.freq+args.lo_offset,
+                        rf_freq=args.freq + args.lo_offset,
                         rf_freq_policy=uhd.tune_request.POLICY_MANUAL,
                         dsp_freq=tune_resp.actual_dsp_freq,
                         dsp_freq_policy=uhd.tune_request.POLICY_MANUAL)
@@ -251,7 +259,8 @@ class UHDApp:
                     self.usrp.set_command_time(cmd_time, mb_idx)
                 command_time_set = True
             except RuntimeError:
-                sys.stderr.write('[{prefix}] [WARNING] Failed to set command times.\n'.format(prefix=self.prefix))
+                sys.stderr.write('[{prefix}] [WARNING] Failed to set command times.\n'.format(
+                    prefix=self.prefix))
         for i, chan in enumerate(self.channels):
             self.tr = self.usrp.set_center_freq(treq, i)
             if self.tr is None:
@@ -268,7 +277,8 @@ class UHDApp:
         if args.show_async_msg:
             self.async_msgq = gr.msg_queue(0)
             self.async_src = uhd.amsg_source("", self.async_msgq)
-            self.async_rcv = uhd.msgq_runner(self.async_msgq, self.async_callback)
+            self.async_rcv = uhd.msgq_runner(
+                self.async_msgq, self.async_callback)
 
     def set_gain(self, gain):
         """
@@ -278,7 +288,8 @@ class UHDApp:
         """
         if gain is None:
             if self.args.verbose:
-                self.vprint("Defaulting to mid-point gains:".format(prefix=self.prefix))
+                self.vprint(
+                    "Defaulting to mid-point gains:".format(prefix=self.prefix))
             for i, chan in enumerate(self.channels):
                 self.usrp.set_normalized_gain(.5, i)
                 if self.args.verbose:
@@ -304,7 +315,8 @@ class UHDApp:
         """
         Safely tune all channels to freq.
         """
-        self.vprint("Tuning all channels to {freq} MHz.".format(freq=freq / 1e6))
+        self.vprint(
+            "Tuning all channels to {freq} MHz.".format(freq=freq / 1e6))
         # Set frequency (tune request takes lo_offset):
         if hasattr(self.args, 'lo_offset') and self.args.lo_offset is not None:
             treq = uhd.tune_request(freq, self.args.lo_offset)
@@ -316,7 +328,7 @@ class UHDApp:
             if getattr(self.args, 'lo_offset', None) is not None:
                 treq = uhd.tune_request(
                     target_freq=freq,
-                    rf_freq=freq+self.args.lo_offset,
+                    rf_freq=freq + self.args.lo_offset,
                     rf_freq_policy=uhd.tune_request.POLICY_MANUAL,
                     dsp_freq=tune_resp.actual_dsp_freq,
                     dsp_freq_policy=uhd.tune_request.POLICY_MANUAL)
@@ -340,7 +352,8 @@ class UHDApp:
                     self.usrp.set_command_time(cmd_time, mb_idx)
                 command_time_set = True
             except RuntimeError:
-                sys.stderr.write('[{prefix}] [WARNING] Failed to set command times.\n'.format(prefix=self.prefix))
+                sys.stderr.write('[{prefix}] [WARNING] Failed to set command times.\n'.format(
+                    prefix=self.prefix))
         for i, chan in enumerate(self.channels):
             self.tr = self.usrp.set_center_freq(treq, i)
             if self.tr is None:
@@ -354,16 +367,17 @@ class UHDApp:
             self.vprint("Syncing channels...".format(prefix=self.prefix))
             time.sleep(COMMAND_DELAY)
         self.freq = self.usrp.get_center_freq(0)
-        self.vprint("First channel has freq: {freq} MHz.".format(freq=self.freq / 1e6))
+        self.vprint("First channel has freq: {freq} MHz.".format(
+            freq=self.freq / 1e6))
 
     @staticmethod
     def setup_argparser(
-            parser=None,
-            description='USRP App',
-            allow_mimo=True,
-            tx_or_rx="",
-            skip_freq=False,
-        ):
+        parser=None,
+        description='USRP App',
+        allow_mimo=True,
+        tx_or_rx="",
+        skip_freq=False,
+    ):
         """
         Create or amend an argument parser with typical USRP options.
         """
@@ -374,19 +388,22 @@ class UHDApp:
             try:
                 return [int(x.strip()) for x in string.split(",")]
             except ValueError:
-                raise argparse.ArgumentTypeError("Not a comma-separated list: {string}".format(string=string))
+                raise argparse.ArgumentTypeError(
+                    "Not a comma-separated list: {string}".format(string=string))
         if parser is None:
             parser = argparse.ArgumentParser(
                 description=description,
             )
         tx_or_rx = tx_or_rx.strip() + " "
         group = parser.add_argument_group('USRP Arguments')
-        group.add_argument("-a", "--args", default="", help="UHD device address args")
+        group.add_argument("-a", "--args", default="",
+                           help="UHD device address args")
         group.add_argument(
             "--spec",
             help="Subdevice(s) of UHD device where appropriate. "
                  "Use a comma-separated list to set different boards to different specs.")
-        group.add_argument("-A", "--antenna", help="Select {xx}antenna(s) where appropriate".format(xx=tx_or_rx))
+        group.add_argument(
+            "-A", "--antenna", help="Select {xx}antenna(s) where appropriate".format(xx=tx_or_rx))
         group.add_argument("-s", "--samp-rate", type=eng_arg.eng_float, default=1e6,
                            help="Sample rate")
         group.add_argument("-g", "--gain", type=eng_arg.eng_float, default=None,
@@ -403,7 +420,7 @@ class UHDApp:
             group.add_argument("--lo-offset", type=eng_arg.eng_float, default=0.0,
                                help="Set daughterboard LO offset to OFFSET [default=hw default]")
         if allow_mimo:
-            group.add_argument("-c", "--channels", default=[0,], type=cslist,
+            group.add_argument("-c", "--channels", default=[0, ], type=cslist,
                                help="Select {xx} Channels".format(xx=tx_or_rx))
         group.add_argument(
             "--lo-export",
@@ -415,8 +432,10 @@ class UHDApp:
                  "for each channel with a comma-separated list. None skips this channel.")
         group.add_argument("--otw-format", choices=['sc16', 'sc12', 'sc8'], default='sc16',
                            help="Choose over-the-wire data format")
-        group.add_argument("--stream-args", default="", help="Set additional stream arguments")
-        group.add_argument("-v", "--verbose", action="count", help="Use verbose console output")
+        group.add_argument("--stream-args", default="",
+                           help="Set additional stream arguments")
+        group.add_argument("-v", "--verbose", action="count",
+                           help="Use verbose console output")
         group.add_argument("--show-async-msg", action="store_true",
                            help="Show asynchronous message notifications from UHD")
         group.add_argument("--sync", choices=('default', 'pps', 'auto'),
diff --git a/gr-uhd/apps/uhd_fft b/gr-uhd/apps/uhd_fft
index 05f2ee3008..fc5e9276c2 100755
--- a/gr-uhd/apps/uhd_fft
+++ b/gr-uhd/apps/uhd_fft
@@ -42,7 +42,7 @@ import time
 import math
 import signal
 from PyQt5 import Qt
-import sip # Needs to be imported after PyQt5, could fail otherwise
+import sip  # Needs to be imported after PyQt5, could fail otherwise
 from gnuradio import eng_notation
 from gnuradio import eng_arg
 from gnuradio import gr
@@ -60,10 +60,12 @@ except ImportError:
 # pylint: disable=c-extension-no-member
 # pylint: disable=no-member
 
+
 class uhd_fft(UHDApp, gr.top_block, Qt.QWidget):
     """
     Simple UHD Spectrum Analyzer / Scope App.
     """
+
     def __init__(self, args):
         UHDApp.__init__(self, args=args, prefix="UHD FFT")
         gr.top_block.__init__(self, "UHD FFT")
@@ -137,13 +139,15 @@ class uhd_fft(UHDApp, gr.top_block, Qt.QWidget):
         self._ant_options = self.usrp.get_antennas(0)
         for c in range(len(self.channels)):
             self.usrp.set_bandwidth(self.samp_rate + abs(self.lo_offset), c)
-        self.usrp_device_info = self.get_usrp_info_string(compact=True, tx_or_rx='rx')
+        self.usrp_device_info = self.get_usrp_info_string(
+            compact=True, tx_or_rx='rx')
 
         ### Now set up the GUI widgets: #####################################
         # Sampling rate:
         self._samp_rate__tool_bar = Qt.QToolBar(self)
         self._samp_rate__tool_bar.addWidget(Qt.QLabel("Sampling Rate: "))
-        self._samp_rate__line_edit = Qt.QLineEdit(eng_notation.num_to_str(self.samp_rate))
+        self._samp_rate__line_edit = Qt.QLineEdit(
+            eng_notation.num_to_str(self.samp_rate))
         self._samp_rate__tool_bar.addWidget(self._samp_rate__line_edit)
         self._samp_rate__line_edit.returnPressed.connect(
             lambda: self.set_samp_rate(eng_notation.str_to_num(
@@ -190,28 +194,32 @@ class uhd_fft(UHDApp, gr.top_block, Qt.QWidget):
         for label in self._ant_labels:
             self._ant_combo_box.addItem(label)
         self._ant_callback = \
-                lambda i: Qt.QMetaObject.invokeMethod(
-                    self._ant_combo_box,
-                    "setCurrentIndex",
-                    Qt.Q_ARG("int", self._ant_options.index(i)))
+            lambda i: Qt.QMetaObject.invokeMethod(
+                self._ant_combo_box,
+                "setCurrentIndex",
+                Qt.Q_ARG("int", self._ant_options.index(i)))
         self._ant_callback(self.antenna)
-        self._ant_combo_box.currentIndexChanged.connect(lambda i: self.set_ant(self._ant_options[i]))
+        self._ant_combo_box.currentIndexChanged.connect(
+            lambda i: self.set_ant(self._ant_options[i]))
         self.top_grid_layout.addWidget(self._ant_tool_bar, 4, 2, 1, 2)
         # Device + UHD info:
         self._usrp_device_info_tool_bar = Qt.QToolBar(self)
         self._usrp_device_info_formatter = lambda x: x
-        self._usrp_device_info_tool_bar.addWidget(Qt.QLabel("Device Information: "))
+        self._usrp_device_info_tool_bar.addWidget(
+            Qt.QLabel("Device Information: "))
         self._usrp_device_info_label = Qt.QLabel(
             str(self._usrp_device_info_formatter(self.usrp_device_info)))
         self._usrp_device_info_tool_bar.addWidget(self._usrp_device_info_label)
-        self.top_grid_layout.addWidget(self._usrp_device_info_tool_bar, 1, 2, 1, 2)
+        self.top_grid_layout.addWidget(
+            self._usrp_device_info_tool_bar, 1, 2, 1, 2)
         self._uhd_version_info_tool_bar = Qt.QToolBar(self)
         self._uhd_version_info_formatter = lambda x: x
         self._uhd_version_info_tool_bar.addWidget(Qt.QLabel("UHD Version: "))
         self._uhd_version_info_label = Qt.QLabel(
             str(self._uhd_version_info_formatter(self.uhd_version_info)))
         self._uhd_version_info_tool_bar.addWidget(self._uhd_version_info_label)
-        self.top_grid_layout.addWidget(self._uhd_version_info_tool_bar, 1, 0, 1, 2)
+        self.top_grid_layout.addWidget(
+            self._uhd_version_info_tool_bar, 1, 0, 1, 2)
         ### Plot GUIs #######################################################
         widths = [1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
         colors = ["blue", "red", "green", "cyan", "magenta", "black", "yellow",
@@ -221,48 +229,53 @@ class uhd_fft(UHDApp, gr.top_block, Qt.QWidget):
         alphas = [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0]
         self.display = Qt.QTabWidget()
         self.display_widget_0 = Qt.QWidget()
-        self.display_layout_0 = Qt.QBoxLayout(Qt.QBoxLayout.TopToBottom, self.display_widget_0)
+        self.display_layout_0 = Qt.QBoxLayout(
+            Qt.QBoxLayout.TopToBottom, self.display_widget_0)
         self.display_grid_layout_0 = Qt.QGridLayout()
         self.display_layout_0.addLayout(self.display_grid_layout_0)
         self.display.addTab(self.display_widget_0, "Spectrum")
         self.display_widget_1 = Qt.QWidget()
-        self.display_layout_1 = Qt.QBoxLayout(Qt.QBoxLayout.TopToBottom, self.display_widget_1)
+        self.display_layout_1 = Qt.QBoxLayout(
+            Qt.QBoxLayout.TopToBottom, self.display_widget_1)
         self.display_grid_layout_1 = Qt.QGridLayout()
         self.display_layout_1.addLayout(self.display_grid_layout_1)
         self.display.addTab(self.display_widget_1, "Waterfall")
         self.display_widget_2 = Qt.QWidget()
-        self.display_layout_2 = Qt.QBoxLayout(Qt.QBoxLayout.TopToBottom, self.display_widget_2)
+        self.display_layout_2 = Qt.QBoxLayout(
+            Qt.QBoxLayout.TopToBottom, self.display_widget_2)
         self.display_grid_layout_2 = Qt.QGridLayout()
         self.display_layout_2.addLayout(self.display_grid_layout_2)
         self.display.addTab(self.display_widget_2, "Scope")
         self.top_grid_layout.addWidget(self.display, 0, 0, 1, 4)
         self.qtgui_waterfall_sink_x_0 = qtgui.waterfall_sink_c(
-            self.fft_size, #size
-            fft.window.WIN_BLACKMAN_hARRIS, #wintype
-            self.freq, #fc
-            self.samp_rate, #bw
-            "", #name
-            len(self.channels), #number of inputs
-            None # parent
+            self.fft_size,  # size
+            fft.window.WIN_BLACKMAN_hARRIS,  # wintype
+            self.freq,  # fc
+            self.samp_rate,  # bw
+            "",  # name
+            len(self.channels),  # number of inputs
+            None  # parent
         )
         self.qtgui_waterfall_sink_x_0.set_update_time(self.update_rate)
         self.qtgui_waterfall_sink_x_0.enable_grid(False)
         self.qtgui_waterfall_sink_x_0.disable_legend()
-        alpha = 10.**(len(self.channels)-1)
+        alpha = 10.**(len(self.channels) - 1)
         for i in range(len(self.channels)):
-            self.qtgui_waterfall_sink_x_0.set_line_label(i, "Channel {0}".format(i))
+            self.qtgui_waterfall_sink_x_0.set_line_label(
+                i, "Channel {0}".format(i))
             self.qtgui_waterfall_sink_x_0.set_color_map(i, 0)
             self.qtgui_waterfall_sink_x_0.set_line_alpha(i, alpha)
         self.qtgui_waterfall_sink_x_0.set_intensity_range(-90, 10)
         self._qtgui_waterfall_sink_x_0_win = sip.wrapinstance(
             self.qtgui_waterfall_sink_x_0.qwidget(), Qt.QWidget)
-        self.display_grid_layout_1.addWidget(self._qtgui_waterfall_sink_x_0_win, 0, 0, 1, 4)
+        self.display_grid_layout_1.addWidget(
+            self._qtgui_waterfall_sink_x_0_win, 0, 0, 1, 4)
         self.qtgui_time_sink_x_0 = qtgui.time_sink_c(
-            1024, #size
-            self.samp_rate, #samp_rate
-            "", #name
-            len(self.channels), #number of inputs
-            None # parent
+            1024,  # size
+            self.samp_rate,  # samp_rate
+            "",  # name
+            len(self.channels),  # number of inputs
+            None  # parent
         )
         self.qtgui_time_sink_x_0.set_update_time(self.update_rate)
         self.qtgui_time_sink_x_0.set_y_axis(-1, 1)
@@ -274,11 +287,13 @@ class uhd_fft(UHDApp, gr.top_block, Qt.QWidget):
         self.qtgui_time_sink_x_0.enable_grid(False)
         self.qtgui_time_sink_x_0.enable_control_panel(True)
         self.qtgui_time_sink_x_0.disable_legend()
-        for i in range(2*len(self.channels)):
+        for i in range(2 * len(self.channels)):
             if i % 2 == 0:
-                self.qtgui_time_sink_x_0.set_line_label(i, "Re{{Channel {0}}}".format(i//2))
+                self.qtgui_time_sink_x_0.set_line_label(
+                    i, "Re{{Channel {0}}}".format(i // 2))
             else:
-                self.qtgui_time_sink_x_0.set_line_label(i, "Im{{Channel {0}}}".format(i//2))
+                self.qtgui_time_sink_x_0.set_line_label(
+                    i, "Im{{Channel {0}}}".format(i // 2))
             self.qtgui_time_sink_x_0.set_line_width(i, widths[i])
             self.qtgui_time_sink_x_0.set_line_color(i, colors[i])
             self.qtgui_time_sink_x_0.set_line_style(i, styles[i])
@@ -286,15 +301,16 @@ class uhd_fft(UHDApp, gr.top_block, Qt.QWidget):
             self.qtgui_time_sink_x_0.set_line_alpha(i, alphas[i])
         self._qtgui_time_sink_x_0_win = sip.wrapinstance(
             self.qtgui_time_sink_x_0.qwidget(), Qt.QWidget)
-        self.display_grid_layout_2.addWidget(self._qtgui_time_sink_x_0_win, 0, 0, 1, 4)
+        self.display_grid_layout_2.addWidget(
+            self._qtgui_time_sink_x_0_win, 0, 0, 1, 4)
         self.qtgui_freq_sink_x_0 = qtgui.freq_sink_c(
-            self.fft_size, #size
-            fft.window.WIN_BLACKMAN_hARRIS, #wintype
-            self.freq, #fc
-            self.samp_rate, #bw
-            "", #name
-            len(self.channels), #number of inputs
-            None #parent
+            self.fft_size,  # size
+            fft.window.WIN_BLACKMAN_hARRIS,  # wintype
+            self.freq,  # fc
+            self.samp_rate,  # bw
+            "",  # name
+            len(self.channels),  # number of inputs
+            None  # parent
         )
         self.qtgui_freq_sink_x_0.set_update_time(self.update_rate)
         self.qtgui_freq_sink_x_0.set_y_axis(-100, 10)
@@ -302,7 +318,8 @@ class uhd_fft(UHDApp, gr.top_block, Qt.QWidget):
             self.qtgui_freq_sink_x_0.set_y_label("Relative Gain", "dB")
         else:
             self.qtgui_freq_sink_x_0.set_y_label("Received Power", "dBm")
-        self.qtgui_freq_sink_x_0.set_trigger_mode(qtgui.TRIG_MODE_FREE, 0.0, 0, "")
+        self.qtgui_freq_sink_x_0.set_trigger_mode(
+            qtgui.TRIG_MODE_FREE, 0.0, 0, "")
         self.qtgui_freq_sink_x_0.enable_autoscale(True)
         self.qtgui_freq_sink_x_0.enable_grid(True)
         self.qtgui_freq_sink_x_0.set_fft_average(self.fft_average)
@@ -318,12 +335,14 @@ class uhd_fft(UHDApp, gr.top_block, Qt.QWidget):
             self.qtgui_freq_sink_x_0.set_line_alpha(i, alphas[i])
         self._qtgui_freq_sink_x_0_win = sip.wrapinstance(
             self.qtgui_freq_sink_x_0.qwidget(), Qt.QWidget)
-        self.display_grid_layout_0.addWidget(self._qtgui_freq_sink_x_0_win, 0, 0, 1, 4)
+        self.display_grid_layout_0.addWidget(
+            self._qtgui_freq_sink_x_0_win, 0, 0, 1, 4)
+
         def _freeze_scaling(widget, sleep_time):
             time.sleep(sleep_time)
             widget.enable_autoscale(False)
         _freeze_fft_thread = threading.Thread(
-            target=lambda: _freeze_scaling(self.qtgui_freq_sink_x_0, .5/self.fft_average))
+            target=lambda: _freeze_scaling(self.qtgui_freq_sink_x_0, .5 / self.fft_average))
         _freeze_fft_thread.daemon = True
         _freeze_fft_thread.start()
         _freeze_scope_thread = threading.Thread(
@@ -338,11 +357,11 @@ class uhd_fft(UHDApp, gr.top_block, Qt.QWidget):
             self.display_layout_phase.addLayout(self.display_grid_layout_phase)
             self.display.addTab(self.display_widget_phase, "Rel. Phase")
             self.qtgui_phase_plot = qtgui.time_sink_f(
-                1024, #size
-                self.samp_rate, #samp_rate
-                "", #name
+                1024,  # size
+                self.samp_rate,  # samp_rate
+                "",  # name
                 len(self.channels) - 1,
-                None # parent
+                None  # parent
             )
             self.qtgui_phase_plot.set_update_time(self.update_rate)
             self.qtgui_phase_plot.set_y_axis(-3.5, 3.5)
@@ -356,7 +375,7 @@ class uhd_fft(UHDApp, gr.top_block, Qt.QWidget):
             self.qtgui_phase_plot.disable_legend()
             for i in range(len(self.channels) - 1):
                 self.qtgui_phase_plot.set_line_label(
-                    i, "Phase Delta Channels {0}/{1}".format(i, i+1))
+                    i, "Phase Delta Channels {0}/{1}".format(i, i + 1))
                 self.qtgui_phase_plot.set_line_width(i, widths[i])
                 self.qtgui_phase_plot.set_line_color(i, colors[i])
                 self.qtgui_phase_plot.set_line_style(i, styles[i])
@@ -364,14 +383,17 @@ class uhd_fft(UHDApp, gr.top_block, Qt.QWidget):
                 self.qtgui_phase_plot.set_line_alpha(i, alphas[i])
             self._qtgui_phase_plot_win = sip.wrapinstance(
                 self.qtgui_phase_plot.qwidget(), Qt.QWidget)
-            self.display_grid_layout_phase.addWidget(self._qtgui_phase_plot_win, 0, 0, 1, 4)
+            self.display_grid_layout_phase.addWidget(
+                self._qtgui_phase_plot_win, 0, 0, 1, 4)
         ### Other widgets ###################################################
         self._lo_locked_probe_tool_bar = Qt.QToolBar(self)
-        self._lo_locked_probe_formatter = lambda x: {True: 'Yes', False: 'No'}[x]
+        self._lo_locked_probe_formatter = lambda x: {
+            True: 'Yes', False: 'No'}[x]
         if self.has_lo_sensor:
             self._lo_locked_probe_tool_bar.addWidget(Qt.QLabel("LO locked: "))
             self._lo_locked_probe_label = Qt.QLabel(
                 str(self._lo_locked_probe_formatter(self.lo_locked_probe)))
+
             def _chan0_lo_locked_probe():
                 while self.has_lo_sensor:
                     self.chan0_lo_locked = self.usrp.get_sensor('lo_locked')
@@ -382,14 +404,18 @@ class uhd_fft(UHDApp, gr.top_block, Qt.QWidget):
                     except AttributeError:
                         pass
                     time.sleep(1.0 / (10))
-            _chan0_lo_locked_thread = threading.Thread(target=_chan0_lo_locked_probe)
+            _chan0_lo_locked_thread = threading.Thread(
+                target=_chan0_lo_locked_probe)
             _chan0_lo_locked_thread.daemon = True
             _chan0_lo_locked_thread.start()
         else:
-            self._lo_locked_probe_tool_bar.addWidget(Qt.QLabel("No LO lock sensor available."))
+            self._lo_locked_probe_tool_bar.addWidget(
+                Qt.QLabel("No LO lock sensor available."))
             self._lo_locked_probe_label = Qt.QLabel("")
         self._lo_locked_probe_tool_bar.addWidget(self._lo_locked_probe_label)
-        self.top_grid_layout.addWidget(self._lo_locked_probe_tool_bar, 4, 0, 1, 2)
+        self.top_grid_layout.addWidget(
+            self._lo_locked_probe_tool_bar, 4, 0, 1, 2)
+
         def _current_freq_probe():
             while True:
                 val = self.usrp.get_center_freq(0)
@@ -437,19 +463,21 @@ class uhd_fft(UHDApp, gr.top_block, Qt.QWidget):
             else:
                 self.connect((self.usrp, idx), (self.qtgui_freq_sink_x_0, idx))
             self.connect((self.usrp, idx), (self.qtgui_time_sink_x_0, idx))
-            self.connect((self.usrp, idx), (self.qtgui_waterfall_sink_x_0, idx))
+            self.connect((self.usrp, idx),
+                         (self.qtgui_waterfall_sink_x_0, idx))
         if args.phase_relations and len(self.channels) > 1:
             for idx in range(len(self.channels[:-1])):
                 self.connect_phase_plot(
                     (self.usrp, idx),
-                    (self.usrp, idx+1),
+                    (self.usrp, idx + 1),
                     (self.qtgui_phase_plot, idx)
                 )
 
     def connect_phase_plot(self, src_port1, src_port2, dst_port):
         " Calculate relative phase between two src ports and send it dst_port "
         multiplier = blocks.multiply_cc()
-        self.connect(src_port1, (multiplier, 0), blocks.complex_to_arg(), dst_port)
+        self.connect(src_port1, (multiplier, 0),
+                     blocks.complex_to_arg(), dst_port)
         self.connect(src_port2, blocks.conjugate_cc(), (multiplier, 1))
 
     # This is a Qt name:
@@ -484,9 +512,11 @@ class uhd_fft(UHDApp, gr.top_block, Qt.QWidget):
             self._freq_line_edit, "setText",
             Qt.Q_ARG("QString", eng_notation.num_to_str(self.freq))
         )
-        self.qtgui_waterfall_sink_x_0.set_frequency_range(self.freq, self.samp_rate)
+        self.qtgui_waterfall_sink_x_0.set_frequency_range(
+            self.freq, self.samp_rate)
         if tune_source != 'freqsink_msg':
-            self.qtgui_freq_sink_x_0.set_frequency_range(self.freq, self.samp_rate)
+            self.qtgui_freq_sink_x_0.set_frequency_range(
+                self.freq, self.samp_rate)
         if self.gain_type == self.GAIN_TYPE_POWER:
             self.gain = self.get_gain_or_power()
             self._gain__win.d_widget.setValue(self.gain)
@@ -501,7 +531,8 @@ class uhd_fft(UHDApp, gr.top_block, Qt.QWidget):
         )
         self.qtgui_freq_sink_x_0.set_frequency_range(self.freq, self.samp_rate)
         self.qtgui_time_sink_x_0.set_samp_rate(self.samp_rate)
-        self.qtgui_waterfall_sink_x_0.set_frequency_range(self.freq, self.samp_rate)
+        self.qtgui_waterfall_sink_x_0.set_frequency_range(
+            self.freq, self.samp_rate)
         self.usrp.set_samp_rate(self.samp_rate)
         for c in range(len(self.channels)):
             self.usrp.set_bandwidth(self.samp_rate + abs(self.lo_offset), c)
@@ -541,7 +572,7 @@ class uhd_fft(UHDApp, gr.top_block, Qt.QWidget):
         Return the input to the power scaler as a function of the current power
         reference level.
         """
-        return 10**(self.gain/20)
+        return 10**(self.gain / 20)
 
 
 def setup_argparser():
@@ -560,7 +591,8 @@ def setup_argparser():
     group.add_argument("--avg-alpha", type=float, default=None,
                        help="Specify FFT average alpha (overrides --fft-average)")
     group.add_argument("--update-rate", dest="update_rate",
-                       type=eng_arg.eng_float, default=eng_notation.num_to_str(.1),
+                       type=eng_arg.eng_float, default=eng_notation.num_to_str(
+                           .1),
                        help="Set GUI widget update period in seconds")
     group.add_argument("--phase-relations", action="store_true",
                        help="Plot relative phases between multiple channels")
@@ -578,6 +610,7 @@ def main():
     top_block.show()
     # Make sure SIGINT/SIGTERM handling is enabled
     # pylint: disable=unused-argument
+
     def sig_handler(sig=None, frame=None):
         top_block.stop()
         top_block.wait()
@@ -589,5 +622,6 @@ def main():
     timer.timeout.connect(lambda: None)
     qapp.exec_()
 
+
 if __name__ == '__main__':
     main()
diff --git a/gr-uhd/apps/uhd_rx_cfile b/gr-uhd/apps/uhd_rx_cfile
index 2ed83c47f0..b6dbb15ccd 100755
--- a/gr-uhd/apps/uhd_rx_cfile
+++ b/gr-uhd/apps/uhd_rx_cfile
@@ -27,26 +27,31 @@ from optparse import OptionParser
 n2s = eng_notation.num_to_str
 COMMAND_DELAY = .2
 
+
 class rx_cfile_block(gr.top_block):
     """
     Simple flowgraph that streams from USRP source to file.
     """
+
     def __init__(self, options, filename):
         gr.top_block.__init__(self)
         # Dissect the channel list:
         try:
-            self.channels = [int(x.strip()) for x in options.channels.split(",")]
+            self.channels = [int(x.strip())
+                             for x in options.channels.split(",")]
         except ValueError:
-            sys.stderr.write("[UHD_RX] [ERROR] Invalid channel list: {}".format(options.channels))
+            sys.stderr.write(
+                "[UHD_RX] [ERROR] Invalid channel list: {}".format(options.channels))
             exit(1)
         # Create file names:
         if len(self.channels) == 1:
-            self.filenames = [filename,]
+            self.filenames = [filename, ]
         else:
             base, ext = os.path.splitext(filename)
             self.filenames = []
             for i in range(len(self.channels)):
-                self.filenames.append("{base}.{num}{ext}".format(base=base, num=i, ext=ext))
+                self.filenames.append(
+                    "{base}.{num}{ext}".format(base=base, num=i, ext=ext))
         # Check CPU format:
         self.cpu_format = 'fc32'
         self.item_size = gr.sizeof_gr_complex
@@ -78,7 +83,7 @@ class rx_cfile_block(gr.top_block):
                 ))
                 exit(1)
             if len(self.antenna) == 1 and len(self.channels) > 1:
-                self.antenna = [self.antenna[0],] * len(self.channels)
+                self.antenna = [self.antenna[0], ] * len(self.channels)
             for i, chan in enumerate(self.channels):
                 self._u.set_antenna(self.antenna[i], chan)
                 if options.verbose:
@@ -93,7 +98,8 @@ class rx_cfile_block(gr.top_block):
             print("[UHD_RX] Defaulting to mid-point gains:")
             for chan in self.channels:
                 self._u.set_normalized_gain(.5, chan)
-                print("[UHD_RX] Channel {chan} gain: {g} dB".format(chan=chan, g=self._u.get_gain(chan)))
+                print("[UHD_RX] Channel {chan} gain: {g} dB".format(
+                    chan=chan, g=self._u.get_gain(chan)))
         else:
             for chan in self.channels:
                 if options.normalized_gain:
@@ -117,11 +123,13 @@ class rx_cfile_block(gr.top_block):
                     self._u.set_command_time(cmd_time, mb_idx)
                 command_time_set = True
             except RuntimeError:
-                sys.stderr.write('[UHD_RX] [WARNING] Failed to set command times.\n')
+                sys.stderr.write(
+                    '[UHD_RX] [WARNING] Failed to set command times.\n')
         for chan in self.channels:
             tr = self._u.set_center_freq(treq, chan)
             if tr == None:
-                sys.stderr.write('[UHD_RX] [ERROR] Failed to set center frequency on channel {chan}\n'.format(chan=chan))
+                sys.stderr.write(
+                    '[UHD_RX] [ERROR] Failed to set center frequency on channel {chan}\n'.format(chan=chan))
                 exit(1)
         if command_time_set:
             for mb_idx in range(self._u.get_num_mboards()):
@@ -135,16 +143,18 @@ class rx_cfile_block(gr.top_block):
             if options.metafile:
                 # store additional metadata
                 extras = pmt.make_dict()
-                extras = pmt.dict_add(extras, pmt.intern("rx_gain"), pmt.from_double(gain))
+                extras = pmt.dict_add(extras, pmt.intern(
+                    "rx_gain"), pmt.from_double(gain))
                 extras_str = pmt.serialize_str(extras)
                 self._sink.append(blocks.file_meta_sink(
-                        self.item_size, self.filenames[i],
-                        samp_rate, 1,
-                        self.meta_file_type, True,
-                        1000000, extras_str, False
+                    self.item_size, self.filenames[i],
+                    samp_rate, 1,
+                    self.meta_file_type, True,
+                    1000000, extras_str, False
                 ))
             else:
-                self._sink.append(blocks.file_sink(self.item_size, self.filenames[i]))
+                self._sink.append(blocks.file_sink(
+                    self.item_size, self.filenames[i]))
             # Create head block if needed and wire it up:
             if options.nsamples is None:
                 self.connect((self._u, i), self._sink[i])
@@ -167,40 +177,51 @@ class rx_cfile_block(gr.top_block):
                     rx_serial = info["rx_serial"]
                 rx_antenna = info["rx_antenna"]
                 rx_subdev_spec = info["rx_subdev_spec"]
-                print("[UHD_RX] Motherboard: %s (%s)" % (mboard_id, mboard_serial))
+                print("[UHD_RX] Motherboard: %s (%s)" %
+                      (mboard_id, mboard_serial))
                 if "B200" in mboard_id or "B210" in mboard_id or "E310" in mboard_id:
-                    print("[UHD_RX] Daughterboard: %s (%s, %s)" % (mboard_id, rx_antenna, rx_subdev_spec))
+                    print("[UHD_RX] Daughterboard: %s (%s, %s)" %
+                          (mboard_id, rx_antenna, rx_subdev_spec))
                 else:
-                    print("[UHD_RX] Daughterboard: %s (%s, %s, %s)" % (rx_id, rx_serial, rx_antenna, rx_subdev_spec))
+                    print("[UHD_RX] Daughterboard: %s (%s, %s, %s)" %
+                          (rx_id, rx_serial, rx_antenna, rx_subdev_spec))
             except KeyError:
                 print("[UHD_RX] Args: ", options.args)
             print("[UHD_RX] Receiving on {} channels.".format(len(self.channels)))
             print("[UHD_RX] Rx gain:               {gain}".format(gain=gain))
             print("[UHD_RX] Rx frequency:          {freq}".format(freq=freq))
-            print("[UHD_RX] Rx baseband frequency: {actual}".format(actual=n2s(tr.actual_rf_freq)))
-            print("[UHD_RX] Rx DDC frequency:      {dsp}".format(dsp=n2s(tr.actual_dsp_freq)))
-            print("[UHD_RX] Rx Sample Rate:        {rate}".format(rate=n2s(samp_rate)))
+            print("[UHD_RX] Rx baseband frequency: {actual}".format(
+                actual=n2s(tr.actual_rf_freq)))
+            print("[UHD_RX] Rx DDC frequency:      {dsp}".format(
+                dsp=n2s(tr.actual_dsp_freq)))
+            print("[UHD_RX] Rx Sample Rate:        {rate}".format(
+                rate=n2s(samp_rate)))
             if options.nsamples is None:
                 print("[UHD_RX] Receiving samples until Ctrl-C")
             else:
-                print("[UHD_RX] Receiving {n} samples.".format(n=n2s(options.nsamples)))
+                print("[UHD_RX] Receiving {n} samples.".format(
+                    n=n2s(options.nsamples)))
             if options.output_shorts:
                 print("[UHD_RX] Writing 16-bit complex shorts")
             else:
                 print("[UHD_RX] Writing 32-bit complex floats")
-            print("[UHD_RX] Output file(s): {files}".format(files=", ".join(self.filenames)))
+            print("[UHD_RX] Output file(s): {files}".format(
+                files=", ".join(self.filenames)))
         # Direct asynchronous notifications to callback function:
         if options.show_async_msg:
             self.async_msgq = gr.msg_queue(0)
             self.async_src = uhd.amsg_source("", self.async_msgq)
-            self.async_rcv = uhd.msgq_runner(self.async_msgq, self.async_callback)
+            self.async_rcv = uhd.msgq_runner(
+                self.async_msgq, self.async_callback)
 
     def async_callback(self, msg):
         md = self.async_src.msg_to_async_metadata_t(msg)
-        print("[UHD_RX] Channel: %i Time: %f Event: %i" % (md.channel, md.time_spec.get_real_secs(), md.event_code))
+        print("[UHD_RX] Channel: %i Time: %f Event: %i" %
+              (md.channel, md.time_spec.get_real_secs(), md.event_code))
+
 
 def get_options():
-    usage="%prog: [options] output_filename"
+    usage = "%prog: [options] output_filename"
     parser = OptionParser(option_class=eng_option, usage=usage)
     parser.add_option("-a", "--args", type="string", default="",
                       help="UHD device address args , [default=%default]")
@@ -220,9 +241,9 @@ def get_options():
                       help="Set gain in dB (default is midpoint)")
     parser.add_option("--normalized-gain", action="store_true",
                       help="Specify gain as normalized value (in [0, 1])")
-    parser.add_option( "-m","--metafile", action="store_true", default=False,
+    parser.add_option("-m", "--metafile", action="store_true", default=False,
                       help="output metadata to file [default=%default]")
-    parser.add_option( "-s","--output-shorts", action="store_true", default=False,
+    parser.add_option("-s", "--output-shorts", action="store_true", default=False,
                       help="Output interleaved shorts instead of complex floats")
     parser.add_option("-N", "--nsamples", type="eng_float", default=None,
                       help="Number of samples to collect [default=+inf]")
@@ -246,6 +267,7 @@ def get_options():
         exit(1)
     return (options, args[0])
 
+
 if __name__ == '__main__':
     (options, filename) = get_options()
     tb = rx_cfile_block(options, filename)
diff --git a/gr-uhd/apps/uhd_rx_nogui b/gr-uhd/apps/uhd_rx_nogui
index 06bce7ea7f..e091df1327 100755
--- a/gr-uhd/apps/uhd_rx_nogui
+++ b/gr-uhd/apps/uhd_rx_nogui
@@ -60,10 +60,11 @@ from gnuradio.eng_option import eng_option
 
 # (device_rate, channel_rate, audio_rate, channel_pass, channel_stop, demod)
 DEMOD_PARAMS = {
-                'AM'  : (256000,  16000, 16000,  5000,   8000, analog.demod_10k0a3e_cf),
-                'FM'  : (256000,  32000,  8000,  8000,   9000, analog.demod_20k0f3e_cf),
-                'WFM' : (320000, 320000, 32000, 80000, 115000, analog.demod_200kf3e_cf)
-               }
+    'AM': (256000, 16000, 16000, 5000, 8000, analog.demod_10k0a3e_cf),
+    'FM': (256000, 32000, 8000, 8000, 9000, analog.demod_20k0f3e_cf),
+    'WFM': (320000, 320000, 32000, 80000, 115000, analog.demod_200kf3e_cf)
+}
+
 
 class uhd_src(gr.hier_block2):
     """
@@ -74,14 +75,16 @@ class uhd_src(gr.hier_block2):
     Calibration value is the offset from the tuned frequency to
     the actual frequency.
     """
+
     def __init__(self, args, spec, antenna, samp_rate, gain=None, calibration=0.0):
         gr.hier_block2.__init__(
             self, "uhd_src",
             gr.io_signature(0, 0, 0),                    # Input signature
-            gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
+            gr.io_signature(1, 1, gr.sizeof_gr_complex))  # Output signature
 
         self._src = \
-            uhd.usrp_source(device_addr=args, stream_args=uhd.stream_args('fc32'))
+            uhd.usrp_source(device_addr=args,
+                            stream_args=uhd.stream_args('fc32'))
 
         # Set the subdevice spec
         if spec:
@@ -102,7 +105,7 @@ class uhd_src(gr.hier_block2):
         # If no gain specified, set to midrange
         gain_range = self._src.get_gain_range()
         if gain is None:
-            gain = (gain_range.start()+gain_range.stop())/2.0
+            gain = (gain_range.start() + gain_range.stop()) / 2.0
             print("Using gain: ", gain)
         self._src.set_gain(gain)
 
@@ -117,6 +120,7 @@ class uhd_src(gr.hier_block2):
         """ Set sampling rate """
         return self._samp_rate
 
+
 class app_top_block(gr.top_block):
     def __init__(self, options):
         gr.top_block.__init__(self)
@@ -139,24 +143,24 @@ class app_top_block(gr.top_block):
 
         chan_taps = filter.optfir.low_pass(1.0,          # Filter gain
                                            if_rate,      # Sample rate
-                                           channel_pass, # One sided modulation bandwidth
-                                           channel_stop, # One sided channel bandwidth
+                                           channel_pass,  # One sided modulation bandwidth
+                                           channel_stop,  # One sided channel bandwidth
                                            0.1,          # Passband ripple
                                            60)           # Stopband attenuation
 
         chan = filter.freq_xlating_fir_filter_ccf(
-            channel_decim, # Decimation rate
+            channel_decim,  # Decimation rate
             chan_taps,     # Filter taps
             0.0,           # Offset frequency
             if_rate)       # Sample rate
 
         rfsql = analog.pwr_squelch_cc(
             options.rf_squelch,    # Power threshold
-            125.0/channel_rate,    # Time constant
-            int(channel_rate/20),  # 50ms rise/fall
+            125.0 / channel_rate,    # Time constant
+            int(channel_rate / 20),  # 50ms rise/fall
             False)                 # Zero, not gate output
 
-        agc = analog.agc_cc(1.0/channel_rate,  # Time constant
+        agc = analog.agc_cc(1.0 / channel_rate,  # Time constant
                             1.0,               # Reference power
                             1.0)               # Gain
 
@@ -170,7 +174,7 @@ class app_top_block(gr.top_block):
         tail = demod
         if options.ctcss != None and options.ctcss > 60.0:
             ctcss = analog.ctcss_squelch_ff(audio_rate,    # Sample rate
-                                            options.ctcss) # Squelch tone
+                                            options.ctcss)  # Squelch tone
             self.connect(demod, ctcss)
             tail = ctcss
 
@@ -191,7 +195,8 @@ class app_top_block(gr.top_block):
         if self.options.show_async_msg:
             self.async_msgq = gr.msg_queue(0)
             self.async_src = uhd.amsg_source("", self.async_msgq)
-            self.async_rcv = uhd.msgq_runner(self.async_msgq, self.async_callback)
+            self.async_rcv = uhd.msgq_runner(
+                self.async_msgq, self.async_callback)
 
     def async_callback(self, msg):
         """ Callback for processing async messages """
@@ -252,5 +257,6 @@ def main():
     except KeyboardInterrupt:
         pass
 
+
 if __name__ == "__main__":
     main()
diff --git a/gr-uhd/apps/uhd_siggen_base.py b/gr-uhd/apps/uhd_siggen_base.py
index daf8184f56..8d1b37012c 100644
--- a/gr-uhd/apps/uhd_siggen_base.py
+++ b/gr-uhd/apps/uhd_siggen_base.py
@@ -41,14 +41,15 @@ FREQ_RANGE_KEY = 'freq_range'
 TYPE_KEY = 'type'
 
 WAVEFORMS = {
-    analog.GR_CONST_WAVE : "Constant",
-    analog.GR_SIN_WAVE   : "Complex Sinusoid",
-    analog.GR_GAUSSIAN   : "Gaussian Noise",
-    analog.GR_UNIFORM    : "Uniform Noise",
-    "2tone"              : "Two Tone",
-    "sweep"              : "Sweep",
+    analog.GR_CONST_WAVE: "Constant",
+    analog.GR_SIN_WAVE: "Complex Sinusoid",
+    analog.GR_GAUSSIAN: "Gaussian Noise",
+    analog.GR_UNIFORM: "Uniform Noise",
+    "2tone": "Two Tone",
+    "sweep": "Sweep",
 }
 
+
 class USRPSiggen(gr.top_block, pubsub, UHDApp):
     """
     GUI-unaware GNU Radio flowgraph.  This may be used either with command
@@ -87,15 +88,18 @@ class USRPSiggen(gr.top_block, pubsub, UHDApp):
             args=args,
         )
         print("[UHD-SIGGEN] UHD Signal Generator")
-        print("[UHD-SIGGEN] UHD Version: {ver}".format(ver=uhd.get_version_string()))
+        print(
+            "[UHD-SIGGEN] UHD Version: {ver}".format(ver=uhd.get_version_string()))
         print("[UHD-SIGGEN] Using USRP configuration:")
         print(self.get_usrp_info_string(tx_or_rx="tx"))
-        self.usrp_description = self.get_usrp_info_string(tx_or_rx="tx", compact=True)
+        self.usrp_description = self.get_usrp_info_string(
+            tx_or_rx="tx", compact=True)
 
-        ### Set subscribers and publishers:
+        # Set subscribers and publishers:
         self.publish(SAMP_RATE_KEY, lambda: self.usrp.get_samp_rate())
         self.publish(DESC_KEY, lambda: self.usrp_description)
-        self.publish(FREQ_RANGE_KEY, lambda: self.usrp.get_freq_range(self.channels[0]))
+        self.publish(FREQ_RANGE_KEY,
+                     lambda: self.usrp.get_freq_range(self.channels[0]))
         self.publish(GAIN_KEY, lambda: self.get_gain_or_power())
 
         self[SAMP_RATE_KEY] = args.samp_rate
@@ -107,7 +111,7 @@ class USRPSiggen(gr.top_block, pubsub, UHDApp):
         self[DSP_FREQ_KEY] = 0
         self[RF_FREQ_KEY] = 0
 
-        #subscribe set methods
+        # subscribe set methods
         self.subscribe(SAMP_RATE_KEY, self.set_samp_rate)
         self.subscribe(GAIN_KEY, self.set_gain_or_power)
         self.subscribe(TX_FREQ_KEY, self.set_freq)
@@ -117,18 +121,19 @@ class USRPSiggen(gr.top_block, pubsub, UHDApp):
         self.subscribe(TYPE_KEY, self.set_waveform)
         self.subscribe(RF_FREQ_KEY, self.update_gain_range)
 
-        #force update on pubsub keys
+        # force update on pubsub keys
         for key in (SAMP_RATE_KEY, GAIN_KEY, TX_FREQ_KEY,
                     AMPLITUDE_KEY, WAVEFORM_FREQ_KEY,
                     WAVEFORM_OFFSET_KEY, WAVEFORM2_FREQ_KEY):
             self[key] = self[key]
-        self[TYPE_KEY] = args.type #set type last
+        self[TYPE_KEY] = args.type  # set type last
 
     def set_samp_rate(self, samp_rate):
         """
         When sampling rate is updated, also update the signal sources.
         """
-        self.vprint("Setting sampling rate to: {rate} Msps".format(rate=samp_rate / 1e6))
+        self.vprint("Setting sampling rate to: {rate} Msps".format(
+            rate=samp_rate / 1e6))
         self.usrp.set_samp_rate(samp_rate)
         samp_rate = self.usrp.get_samp_rate()
         if self[TYPE_KEY] in (analog.GR_SIN_WAVE, analog.GR_CONST_WAVE):
@@ -138,10 +143,12 @@ class USRPSiggen(gr.top_block, pubsub, UHDApp):
             self._src2.set_sampling_freq(self[SAMP_RATE_KEY])
         elif self[TYPE_KEY] == "sweep":
             self._src1.set_sampling_freq(self[SAMP_RATE_KEY])
-            self._src2.set_sampling_freq(self[WAVEFORM_FREQ_KEY]*2*math.pi/self[SAMP_RATE_KEY])
+            self._src2.set_sampling_freq(
+                self[WAVEFORM_FREQ_KEY] * 2 * math.pi / self[SAMP_RATE_KEY])
         else:
-            return True # Waveform not yet set
-        self.vprint("Set sample rate to: {rate} Msps".format(rate=samp_rate / 1e6))
+            return True  # Waveform not yet set
+        self.vprint("Set sample rate to: {rate} Msps".format(
+            rate=samp_rate / 1e6))
         return True
 
     def set_waveform_freq(self, freq):
@@ -151,7 +158,7 @@ class USRPSiggen(gr.top_block, pubsub, UHDApp):
         elif self[TYPE_KEY] == "2tone":
             self._src1.set_frequency(freq)
         elif self[TYPE_KEY] == 'sweep':
-            #there is no set sensitivity, redo fg
+            # there is no set sensitivity, redo fg
             self[TYPE_KEY] = self[TYPE_KEY]
         return True
 
@@ -178,11 +185,14 @@ class USRPSiggen(gr.top_block, pubsub, UHDApp):
         if waveform_type in (analog.GR_SIN_WAVE, analog.GR_CONST_WAVE):
             self._src = analog.sig_source_c(self[SAMP_RATE_KEY],       # Sample rate
                                             waveform_type,             # Waveform waveform_type
-                                            self[WAVEFORM_FREQ_KEY],   # Waveform frequency
-                                            self[AMPLITUDE_KEY],       # Waveform amplitude
-                                            self[WAVEFORM_OFFSET_KEY]) # Waveform offset
+                                            # Waveform frequency
+                                            self[WAVEFORM_FREQ_KEY],
+                                            # Waveform amplitude
+                                            self[AMPLITUDE_KEY],
+                                            self[WAVEFORM_OFFSET_KEY])  # Waveform offset
         elif waveform_type in (analog.GR_GAUSSIAN, analog.GR_UNIFORM):
-            self._src = analog.noise_source_c(waveform_type, self[AMPLITUDE_KEY])
+            self._src = analog.noise_source_c(
+                waveform_type, self[AMPLITUDE_KEY])
         elif waveform_type == "2tone":
             self._src1 = analog.sig_source_c(self[SAMP_RATE_KEY],
                                              analog.GR_SIN_WAVE,
@@ -211,7 +221,8 @@ class USRPSiggen(gr.top_block, pubsub, UHDApp):
                                              self[WAVEFORM2_FREQ_KEY],
                                              1.0,
                                              -0.5)
-            self._src2 = analog.frequency_modulator_fc(self[WAVEFORM_FREQ_KEY]*2*math.pi/self[SAMP_RATE_KEY])
+            self._src2 = analog.frequency_modulator_fc(
+                self[WAVEFORM_FREQ_KEY] * 2 * math.pi / self[SAMP_RATE_KEY])
             self._src = blocks.multiply_const_cc(self[AMPLITUDE_KEY])
             self.connect(self._src1, self._src2, self._src)
         else:
@@ -224,7 +235,8 @@ class USRPSiggen(gr.top_block, pubsub, UHDApp):
         self.vprint("Set baseband modulation to:", WAVEFORMS[waveform_type])
         n2s = eng_notation.num_to_str
         if waveform_type == analog.GR_SIN_WAVE:
-            self.vprint("Modulation frequency: %sHz" % (n2s(self[WAVEFORM_FREQ_KEY]),))
+            self.vprint("Modulation frequency: %sHz" %
+                        (n2s(self[WAVEFORM_FREQ_KEY]),))
             self.vprint("Initial phase:", self[WAVEFORM_OFFSET_KEY])
         elif waveform_type == "2tone":
             self.vprint("Tone 1: %sHz" % (n2s(self[WAVEFORM_FREQ_KEY]),))
@@ -250,7 +262,7 @@ class USRPSiggen(gr.top_block, pubsub, UHDApp):
         elif self[TYPE_KEY] == "sweep":
             self._src.set_k(amplitude)
         else:
-            return True # Waveform not yet set
+            return True  # Waveform not yet set
         self.vprint("Set amplitude to:", amplitude)
         self.update_gain_range()
         return True
@@ -262,7 +274,7 @@ class USRPSiggen(gr.top_block, pubsub, UHDApp):
         if self.gain_type == self.GAIN_TYPE_GAIN:
             return self.usrp.get_gain(self.channels[0])
         return self.usrp.get_power_reference(self.channels[0]) \
-                    + 20 * math.log10(self[AMPLITUDE_KEY])
+            + 20 * math.log10(self[AMPLITUDE_KEY])
 
     def set_gain_or_power(self, gain_or_power):
         """
@@ -333,6 +345,7 @@ def setup_argparser():
                        help="Generate a swept sine wave")
     return parser
 
+
 def main():
     " Go, go, go! "
     if gr.enable_realtime_scheduling() != gr.RT_OK:
@@ -350,5 +363,6 @@ def main():
     tb.stop()
     tb.wait()
 
+
 if __name__ == "__main__":
     main()
diff --git a/gr-uhd/apps/uhd_siggen_gui b/gr-uhd/apps/uhd_siggen_gui
index 191837ff27..0d9cb56c28 100755
--- a/gr-uhd/apps/uhd_siggen_gui
+++ b/gr-uhd/apps/uhd_siggen_gui
@@ -39,7 +39,7 @@ import time
 import math
 from PyQt5 import Qt
 from PyQt5.QtCore import pyqtSlot
-import sip # Needs to be imported after PyQt5, could fail otherwise
+import sip  # Needs to be imported after PyQt5, could fail otherwise
 from gnuradio import analog
 from gnuradio import eng_notation
 from gnuradio import qtgui
@@ -59,6 +59,7 @@ class uhd_siggen_gui(Qt.QWidget):
     """
     Signal Generator Flowgraph
     """
+
     def __init__(self, args):
         ##################################################
         # Set up the siggen app
@@ -94,14 +95,16 @@ class uhd_siggen_gui(Qt.QWidget):
         ##################################################
         # Widgets + Controls
         ##################################################
-        ### Waveform Selector
+        # Waveform Selector
         self._waveform_options = list(uhd_siggen.WAVEFORMS.keys())
         self._waveform_labels = list(uhd_siggen.WAVEFORMS.values())
         self._waveform_group_box = Qt.QGroupBox("Waveform")
         self._waveform_box = Qt.QHBoxLayout()
+
         class variable_chooser_button_group(Qt.QButtonGroup):
             def __init__(self, parent=None):
                 Qt.QButtonGroup.__init__(self, parent)
+
             @pyqtSlot(int)
             def updateButtonChecked(self, button_id):
                 self.button(button_id).setChecked(True)
@@ -121,14 +124,14 @@ class uhd_siggen_gui(Qt.QWidget):
             lambda i: self.set_waveform(self._waveform_options[i])
         )
         self.top_grid_layout.addWidget(self._waveform_group_box, 0, 0, 1, 5)
-        ### Center Frequency Sliders
+        # Center Frequency Sliders
         self.freq_coarse = self._sg.usrp.get_center_freq(self._sg.channels[0])
         self._freq_coarse_range = Range(
             self.usrp.get_freq_range(self._sg.channels[0]).start(),
             self.usrp.get_freq_range(self._sg.channels[0]).stop(),
-            1e3, # Step
+            1e3,  # Step
             self.freq_coarse,
-            200, # Min Width
+            200,  # Min Width
         )
         self._freq_coarse_win = RangeWidget(
             self._freq_coarse_range,
@@ -154,8 +157,8 @@ class uhd_siggen_gui(Qt.QWidget):
         self.top_grid_layout.addWidget(self._freq_fine_win, 2, 0, 1, 5)
         self.lo_offset = self._sg.args.lo_offset
         self._lo_offset_range = Range(
-            -self._sg[uhd_siggen.SAMP_RATE_KEY]/2,
-            self._sg[uhd_siggen.SAMP_RATE_KEY]/2,
+            -self._sg[uhd_siggen.SAMP_RATE_KEY] / 2,
+            self._sg[uhd_siggen.SAMP_RATE_KEY] / 2,
             1e3,
             self.lo_offset,
             200
@@ -168,11 +171,11 @@ class uhd_siggen_gui(Qt.QWidget):
             float
         )
         self.top_grid_layout.addWidget(self._lo_offset_win, 3, 0, 1, 5)
-        ### Signal frequencies
+        # Signal frequencies
         self._freq1_enable_on = (analog.GR_SIN_WAVE, "2tone", "sweep")
         self._freq1_offset_range = Range(
-            -self._sg[uhd_siggen.SAMP_RATE_KEY]/2,
-            self._sg[uhd_siggen.SAMP_RATE_KEY]/2,
+            -self._sg[uhd_siggen.SAMP_RATE_KEY] / 2,
+            self._sg[uhd_siggen.SAMP_RATE_KEY] / 2,
             100,
             self._sg.args.waveform_freq,
             200
@@ -184,12 +187,13 @@ class uhd_siggen_gui(Qt.QWidget):
             "counter_slider",
             float
         )
-        self._freq1_offset_win.setEnabled(self._sg[uhd_siggen.TYPE_KEY] in self._freq1_enable_on)
+        self._freq1_offset_win.setEnabled(
+            self._sg[uhd_siggen.TYPE_KEY] in self._freq1_enable_on)
         self.top_grid_layout.addWidget(self._freq1_offset_win, 4, 0, 1, 3)
         self._freq2_enable_on = ("2tone", "sweep")
         self._freq2_offset_range = Range(
-            -self._sg[uhd_siggen.SAMP_RATE_KEY]/2,
-            self._sg[uhd_siggen.SAMP_RATE_KEY]/2,
+            -self._sg[uhd_siggen.SAMP_RATE_KEY] / 2,
+            self._sg[uhd_siggen.SAMP_RATE_KEY] / 2,
             100,
             self._sg.args.waveform2_freq,
             200
@@ -201,9 +205,10 @@ class uhd_siggen_gui(Qt.QWidget):
             "counter_slider",
             float
         )
-        self._freq2_offset_win.setEnabled(self._sg[uhd_siggen.TYPE_KEY] in self._freq2_enable_on)
+        self._freq2_offset_win.setEnabled(
+            self._sg[uhd_siggen.TYPE_KEY] in self._freq2_enable_on)
         self.top_grid_layout.addWidget(self._freq2_offset_win, 4, 3, 1, 2)
-        ### Amplitude
+        # Amplitude
         min_ampl = \
             self._sg.MIN_AMP_POWER_MODE \
             if self._sg.gain_type == self._sg.GAIN_TYPE_POWER else 0
@@ -235,7 +240,7 @@ class uhd_siggen_gui(Qt.QWidget):
             float
         )
         self.top_grid_layout.addWidget(self._gain_win, 6, 0, 1, 5)
-        ### Samp rate, LO sync, Antenna Select
+        # Samp rate, LO sync, Antenna Select
         self.samp_rate = self._sg[uhd_siggen.SAMP_RATE_KEY]
         self._samp_rate_tool_bar = Qt.QToolBar(self)
         self._samp_rate_tool_bar.addWidget(Qt.QLabel("Sampling Rate: "))
@@ -248,7 +253,8 @@ class uhd_siggen_gui(Qt.QWidget):
         )
         self.top_grid_layout.addWidget(self._samp_rate_tool_bar, 7, 0, 1, 2)
         _sync_phases_push_button = Qt.QPushButton("Sync LOs")
-        _sync_phases_push_button.pressed.connect(lambda: self.set_sync_phases(True))
+        _sync_phases_push_button.pressed.connect(
+            lambda: self.set_sync_phases(True))
         _sync_phases_push_button.setEnabled(bool(len(self._sg.channels) > 1))
         self.top_grid_layout.addWidget(_sync_phases_push_button, 7, 2, 1, 1)
         # Antenna Select
@@ -272,8 +278,11 @@ class uhd_siggen_gui(Qt.QWidget):
         self._lo_locked_probe_0_formatter = lambda x: x
         self._lo_locked_probe_0_tool_bar.addWidget(Qt.QLabel("LO locked: "))
         self._lo_locked_probe_0_label = Qt.QLabel(str(False))
-        self._lo_locked_probe_0_tool_bar.addWidget(self._lo_locked_probe_0_label)
-        self.top_grid_layout.addWidget(self._lo_locked_probe_0_tool_bar, 8, 0, 1, 1)
+        self._lo_locked_probe_0_tool_bar.addWidget(
+            self._lo_locked_probe_0_label)
+        self.top_grid_layout.addWidget(
+            self._lo_locked_probe_0_tool_bar, 8, 0, 1, 1)
+
         def _chan0_lo_locked_probe():
             " Monitor lock status of LO on channel 0 "
             while True:
@@ -285,7 +294,8 @@ class uhd_siggen_gui(Qt.QWidget):
                 except:
                     self.set_chan0_lo_locked("Lock Detect Failed!")
                 time.sleep(.1)
-        _chan0_lo_locked_thread = threading.Thread(target=_chan0_lo_locked_probe)
+        _chan0_lo_locked_thread = threading.Thread(
+            target=_chan0_lo_locked_probe)
         _chan0_lo_locked_thread.daemon = True
         _chan0_lo_locked_thread.start()
         self.label_rf_freq = self._sg.tr.actual_rf_freq
@@ -295,7 +305,8 @@ class uhd_siggen_gui(Qt.QWidget):
         self._label_rf_freq_label = \
             Qt.QLabel(str(self._label_rf_freq_formatter(self.label_rf_freq)))
         self._label_rf_freq_tool_bar.addWidget(self._label_rf_freq_label)
-        self.top_grid_layout.addWidget(self._label_rf_freq_tool_bar, 8, 1, 1, 1)
+        self.top_grid_layout.addWidget(
+            self._label_rf_freq_tool_bar, 8, 1, 1, 1)
         self.label_dsp_freq = self._sg.tr.actual_dsp_freq
         self._label_dsp_freq_tool_bar = Qt.QToolBar(self)
         self._label_dsp_freq_formatter = lambda x: x
@@ -303,22 +314,24 @@ class uhd_siggen_gui(Qt.QWidget):
         self._label_dsp_freq_label = \
             Qt.QLabel(str(self._label_dsp_freq_formatter(self.label_dsp_freq)))
         self._label_dsp_freq_tool_bar.addWidget(self._label_dsp_freq_label)
-        self.top_grid_layout.addWidget(self._label_dsp_freq_tool_bar, 8, 2, 1, 1)
+        self.top_grid_layout.addWidget(
+            self._label_dsp_freq_tool_bar, 8, 2, 1, 1)
         ##################################################
         # Freq Sink
         ##################################################
         if self._sg.args.show_freq_sink:
             self.qtgui_freq_sink_x_0 = qtgui.freq_sink_c(
-                1024, #size
-                fft.window.WIN_BLACKMAN_hARRIS, #wintype
-                self.freq_coarse + self.freq_fine, #fc
-                self.samp_rate, #bw
-                "", #name
-                1 #number of inputs
+                1024,  # size
+                fft.window.WIN_BLACKMAN_hARRIS,  # wintype
+                self.freq_coarse + self.freq_fine,  # fc
+                self.samp_rate,  # bw
+                "",  # name
+                1  # number of inputs
             )
             self.qtgui_freq_sink_x_0.set_update_time(0.10)
             self.qtgui_freq_sink_x_0.set_y_axis(-100, 10)
-            self.qtgui_freq_sink_x_0.set_trigger_mode(qtgui.TRIG_MODE_FREE, 0.0, 0, "")
+            self.qtgui_freq_sink_x_0.set_trigger_mode(
+                qtgui.TRIG_MODE_FREE, 0.0, 0, "")
             self.qtgui_freq_sink_x_0.enable_autoscale(False)
             self.qtgui_freq_sink_x_0.enable_grid(False)
             self.qtgui_freq_sink_x_0.set_fft_average(1.0)
@@ -327,8 +340,10 @@ class uhd_siggen_gui(Qt.QWidget):
             self.qtgui_freq_sink_x_0.set_line_width(0, 1)
             self.qtgui_freq_sink_x_0.set_line_color(0, "blue")
             self.qtgui_freq_sink_x_0.set_line_alpha(0, 1.0)
-            self._qtgui_freq_sink_x_0_win = sip.wrapinstance(self.qtgui_freq_sink_x_0.qwidget(), Qt.QWidget)
-            self.top_grid_layout.addWidget(self._qtgui_freq_sink_x_0_win, 9, 0, 2, 5)
+            self._qtgui_freq_sink_x_0_win = sip.wrapinstance(
+                self.qtgui_freq_sink_x_0.qwidget(), Qt.QWidget)
+            self.top_grid_layout.addWidget(
+                self._qtgui_freq_sink_x_0_win, 9, 0, 2, 5)
             # Reconnect:
             self._sg.extra_sink = self.qtgui_freq_sink_x_0
             self._sg[uhd_siggen.TYPE_KEY] = self._sg[uhd_siggen.TYPE_KEY]
@@ -435,7 +450,8 @@ class uhd_siggen_gui(Qt.QWidget):
     def set_sync_phases(self, sync):
         """ Execute when the sync-phases button is pushed """
         if sync:
-            self._sg.vprint("Attempting to sync LO phases. This does not work with all boards.")
+            self._sg.vprint(
+                "Attempting to sync LO phases. This does not work with all boards.")
             self._sg.set_freq(self.freq_coarse + self.freq_fine, False)
 
     def set_ant(self, ant):
@@ -484,6 +500,7 @@ class uhd_siggen_gui(Qt.QWidget):
             Qt.Q_ARG("QString", str(chan0_lo_locked))
         )
 
+
 def setup_parser():
     """
     Argument parser for siggen_gui
@@ -496,6 +513,7 @@ def setup_parser():
     )
     return parser
 
+
 def main():
     """ Go, go, go! """
     parser = setup_parser()
@@ -504,6 +522,7 @@ def main():
     siggen_gui = uhd_siggen_gui(args)
     siggen_gui.show()
     # pylint: disable=unused-argument
+
     def sig_handler(sig=None, frame=None):
         siggen_gui.stop()
         Qt.QApplication.quit()
@@ -514,5 +533,6 @@ def main():
     timer.timeout.connect(lambda: None)
     qapp.exec_()
 
+
 if __name__ == '__main__':
     main()
diff --git a/gr-uhd/examples/python/freq_hopping.py b/gr-uhd/examples/python/freq_hopping.py
index 8fd65aade8..871181e045 100755
--- a/gr-uhd/examples/python/freq_hopping.py
+++ b/gr-uhd/examples/python/freq_hopping.py
@@ -19,6 +19,7 @@ from gnuradio import gr
 from gnuradio import blocks
 from gnuradio import uhd
 
+
 def setup_parser():
     """ Setup the parser for the frequency hopper. """
     parser = argparse.ArgumentParser(
@@ -77,31 +78,34 @@ def setup_parser():
 
 class FrequencyHopperSrc(gr.hier_block2):
     """ Provides tags for frequency hopping """
+
     def __init__(
-            self,
-            n_bursts, n_channels,
-            freq_delta, base_freq, dsp_tuning,
-            burst_length, base_time, hop_time,
-            post_tuning=False,
-            tx_gain=0,
-            verbose=False
-        ):
+        self,
+        n_bursts, n_channels,
+        freq_delta, base_freq, dsp_tuning,
+        burst_length, base_time, hop_time,
+        post_tuning=False,
+        tx_gain=0,
+        verbose=False
+    ):
         gr.hier_block2.__init__(
             self, "FrequencyHopperSrc",
             gr.io_signature(1, 1, gr.sizeof_gr_complex),
             gr.io_signature(1, 1, gr.sizeof_gr_complex),
         )
         n_samples_total = n_bursts * burst_length
-        lowest_frequency = base_freq - numpy.floor(n_channels/2) * freq_delta
-        self.hop_sequence = [lowest_frequency + n * freq_delta for n in range(n_channels)]
+        lowest_frequency = base_freq - numpy.floor(n_channels / 2) * freq_delta
+        self.hop_sequence = [lowest_frequency + n *
+                             freq_delta for n in range(n_channels)]
         numpy.random.shuffle(self.hop_sequence)
         # Repeat that:
-        self.hop_sequence = [self.hop_sequence[x % n_channels] for x in range(n_bursts)]
+        self.hop_sequence = [self.hop_sequence[x % n_channels]
+                             for x in range(n_bursts)]
         if verbose:
             print("Hop Frequencies  | Hop Pattern")
             print("=================|================================")
             for f in self.hop_sequence:
-                print("{:6.3f} MHz      |  ".format(f/1e6), end='')
+                print("{:6.3f} MHz      |  ".format(f / 1e6), end='')
                 if n_channels < 50:
                     print(" " * int((f - base_freq) / freq_delta) + "#")
                 else:
@@ -113,25 +117,28 @@ class FrequencyHopperSrc(gr.hier_block2):
         gain_tag.offset = 0
         gain_tag.key = pmt.string_to_symbol('tx_command')
         gain_tag.value = pmt.to_pmt({'gain': tx_gain})
-        tag_list = [gain_tag,]
+        tag_list = [gain_tag, ]
         for i in range(len(self.hop_sequence)):
             time = pmt.cons(
-                pmt.from_uint64(int(base_time + i * hop_time+0.01)),
-                pmt.from_double((base_time + i * hop_time+0.01) % 1),
+                pmt.from_uint64(int(base_time + i * hop_time + 0.01)),
+                pmt.from_double((base_time + i * hop_time + 0.01) % 1),
             )
             tune_tag = gr.tag_t()
             tune_tag.offset = i * burst_length
             # TODO dsp_tuning should also be able to do post_tuning
             if i > 0 and post_tuning and not dsp_tuning:
-                tune_tag.offset -= 1 # Move it to last sample of previous burst
+                tune_tag.offset -= 1  # Move it to last sample of previous burst
             if dsp_tuning:
                 tune_tag.key = pmt.string_to_symbol('tx_command')
-                tune_tag.value = pmt.to_pmt({'lo_freq': base_freq, 'dsp_freq': base_freq - self.hop_sequence[i]})
-                tune_tag.value = pmt.dict_add(tune_tag.value, pmt.intern("time"),time)
+                tune_tag.value = pmt.to_pmt(
+                    {'lo_freq': base_freq, 'dsp_freq': base_freq - self.hop_sequence[i]})
+                tune_tag.value = pmt.dict_add(
+                    tune_tag.value, pmt.intern("time"), time)
             else:
                 tune_tag.key = pmt.string_to_symbol('tx_command')
                 tune_tag.value = pmt.to_pmt({'freq': self.hop_sequence[i]})
-                tune_tag.value = pmt.dict_add(tune_tag.value, pmt.intern('time'), time)
+                tune_tag.value = pmt.dict_add(
+                    tune_tag.value, pmt.intern('time'), time)
             tag_list.append(tune_tag)
             length_tag = gr.tag_t()
             length_tag.offset = i * burst_length
@@ -142,11 +149,12 @@ class FrequencyHopperSrc(gr.hier_block2):
             time_tag.offset = i * burst_length
             time_tag.key = pmt.string_to_symbol('tx_time')
             time_tag.value = pmt.make_tuple(
-                    pmt.car(time),
-                    pmt.cdr(time)
+                pmt.car(time),
+                pmt.cdr(time)
             )
             tag_list.append(time_tag)
-        tag_source = blocks.vector_source_c((1.0,) * n_samples_total, repeat=False, tags=tag_list)
+        tag_source = blocks.vector_source_c(
+            (1.0,) * n_samples_total, repeat=False, tags=tag_list)
         mult = blocks.multiply_cc()
         self.connect(self, mult, self)
         self.connect(tag_source, (mult, 1))
@@ -154,10 +162,12 @@ class FrequencyHopperSrc(gr.hier_block2):
 
 class FlowGraph(gr.top_block):
     """ Flow graph that does the frequency hopping. """
+
     def __init__(self, args):
         gr.top_block.__init__(self)
         if args.input_file is not None:
-            src = blocks.file_source(gr.sizeof_gr_complex, args.input_file, repeat=True)
+            src = blocks.file_source(
+                gr.sizeof_gr_complex, args.input_file, repeat=True)
         else:
             src = blocks.vector_source_c((.5,) * int(1e6) * 2, repeat=True)
         # Setup USRP
@@ -189,6 +199,7 @@ class FlowGraph(gr.top_block):
         )
         self.connect(src, hopper_block, self.usrp)
 
+
 def print_hopper_stats(args):
     """ Nothing to do with Grace Hopper """
     print("""
@@ -205,14 +216,16 @@ Transmit Gain      | {gain} dB
 ===================+=========================
     """.format(
         hop_time=args.hop_time,
-        hop_duration=1000.0/args.rate*args.samp_per_burst,
+        hop_duration=1000.0 / args.rate * args.samp_per_burst,
         gain=args.gain if args.gain else "(midpoint)",
-        lowest_freq=args.freq/1e6,
-        highest_freq=(args.freq + (args.num_channels-1) * args.freq_delta)/1e6,
-        freq_delta=args.freq_delta/1e6,
+        lowest_freq=args.freq / 1e6,
+        highest_freq=(args.freq + (args.num_channels - 1) *
+                      args.freq_delta) / 1e6,
+        freq_delta=args.freq_delta / 1e6,
         num_channels=args.num_channels,
-        rate=args.rate/1e6,
-        ))
+        rate=args.rate / 1e6,
+    ))
+
 
 def main():
     """ Go, go, go! """
@@ -227,6 +240,7 @@ def main():
     top_block.usrp.set_time_now(uhd.time_spec(0.0))
     top_block.run()
 
+
 if __name__ == '__main__':
     try:
         main()
diff --git a/gr-uhd/grc/gen_uhd_usrp_blocks.py b/gr-uhd/grc/gen_uhd_usrp_blocks.py
index 8c31038d07..371fe937cc 100644
--- a/gr-uhd/grc/gen_uhd_usrp_blocks.py
+++ b/gr-uhd/grc/gen_uhd_usrp_blocks.py
@@ -594,14 +594,16 @@ ${'$'}{len_tag_name},
 ${'%'} endif
 """
 
+
 def parse_tmpl(_tmpl, **kwargs):
     """ Render _tmpl using the kwargs. """
     from mako.template import Template
     block_template = Template(_tmpl)
     return str(block_template.render(**kwargs))
 
+
 MAX_NUM_MBOARDS = 8
-MAX_NUM_CHANNELS = MAX_NUM_MBOARDS*4
+MAX_NUM_CHANNELS = MAX_NUM_MBOARDS * 4
 
 if __name__ == '__main__':
     for file in sys.argv[1:]:
@@ -612,7 +614,7 @@ if __name__ == '__main__':
             sourk = 'sink'
             direction = 'in'
         else:
-            raise Exception('is % a source or sink?'%file)
+            raise Exception('is % a source or sink?' % file)
         params = ''.join([
             parse_tmpl(PARAMS_TMPL, n=n, sourk=sourk)
             for n in range(MAX_NUM_CHANNELS)
diff --git a/gr-uhd/python/uhd/__init__.py b/gr-uhd/python/uhd/__init__.py
index 7c0f23dde1..1ffa94e821 100644
--- a/gr-uhd/python/uhd/__init__.py
+++ b/gr-uhd/python/uhd/__init__.py
@@ -16,6 +16,8 @@ line.
 ########################################################################
 # Prepare uhd swig module to make it more pythonic
 ########################################################################
+
+
 def _prepare_uhd_python():
     try:
         from . import uhd_python
@@ -25,45 +27,56 @@ def _prepare_uhd_python():
         __path__.append(os.path.join(dirname, "bindings"))
         from . import uhd_python
 
-    #some useful typedefs for the user
+    # some useful typedefs for the user
     setattr(uhd_python, 'freq_range_t', uhd_python.meta_range_t)
     setattr(uhd_python, 'gain_range_t', uhd_python.meta_range_t)
 
-    #Make the python tune request object inherit from float
-    #so that it can be passed in GRC as a frequency parameter.
-    #The type checking in GRC will accept the tune request.
-    #Also use kwargs to construct individual struct elements.
+    # Make the python tune request object inherit from float
+    # so that it can be passed in GRC as a frequency parameter.
+    # The type checking in GRC will accept the tune request.
+    # Also use kwargs to construct individual struct elements.
     class tune_request_t(uhd_python.tune_request_t):
         # def __new__(self, *args, **kwargs): return float.__new__(self)
         def __float__(self): return self.target_freq
+
         def __init__(self, *args, **kwargs):
             super().__init__(*args)
-            for key, val in list(kwargs.items()): setattr(self, key, val)
+            for key, val in list(kwargs.items()):
+                setattr(self, key, val)
     setattr(uhd_python, 'tune_request_t', tune_request_t)
 
-    #handle general things on all uhd_python attributes
-    #Install the __str__ and __repr__ handlers if applicable
-    #Create aliases for uhd swig attributes to avoid the "_t"
+    # handle general things on all uhd_python attributes
+    # Install the __str__ and __repr__ handlers if applicable
+    # Create aliases for uhd swig attributes to avoid the "_t"
     for attr in dir(uhd_python):
         myobj = getattr(uhd_python, attr)
-        if hasattr(myobj, 'to_string'):    myobj.__repr__     = lambda o: o.to_string().strip()
-        if hasattr(myobj, 'to_pp_string'): myobj.__str__      = lambda o: o.to_pp_string().strip()
-        if hasattr(myobj, 'to_bool'):      myobj.__nonzero__  = lambda o: o.to_bool()
-        if hasattr(myobj, 'to_int'):       myobj.__int__      = lambda o: o.to_int()
-        if hasattr(myobj, 'to_real'):      myobj.__float__    = lambda o: o.to_real()
-        if attr.endswith('_t'): setattr(uhd_python, attr[:-2], myobj)
+        if hasattr(myobj, 'to_string'):
+            myobj.__repr__ = lambda o: o.to_string().strip()
+        if hasattr(myobj, 'to_pp_string'):
+            myobj.__str__ = lambda o: o.to_pp_string().strip()
+        if hasattr(myobj, 'to_bool'):
+            myobj.__nonzero__ = lambda o: o.to_bool()
+        if hasattr(myobj, 'to_int'):
+            myobj.__int__ = lambda o: o.to_int()
+        if hasattr(myobj, 'to_real'):
+            myobj.__float__ = lambda o: o.to_real()
+        if attr.endswith('_t'):
+            setattr(uhd_python, attr[:-2], myobj)
 
-    #make a new find devices that casts everything with the pythonized device_addr_t which has __str__
+    # make a new find devices that casts everything with the pythonized device_addr_t which has __str__
     def find_devices(*args, **kwargs):
         def to_pythonized_dev_addr(dev_addr):
             new_dev_addr = uhd_python.device_addr_t()
-            for key in list(dev_addr.keys()): new_dev_addr[key] = dev_addr.get(key)
+            for key in list(dev_addr.keys()):
+                new_dev_addr[key] = dev_addr.get(key)
             return new_dev_addr
         return __builtins__['map'](to_pythonized_dev_addr, uhd_python.find_devices_raw(*args, **kwargs))
     setattr(uhd_python, 'find_devices', find_devices)
 
+
 ########################################################################
 # Initialize this module with the contents of uhd pybind
 ########################################################################
 _prepare_uhd_python()
+
 from .uhd_python import *
diff --git a/gr-uhd/python/uhd/qa_uhd.py b/gr-uhd/python/uhd/qa_uhd.py
index 65b50d794b..c8fb65c144 100644
--- a/gr-uhd/python/uhd/qa_uhd.py
+++ b/gr-uhd/python/uhd/qa_uhd.py
@@ -12,6 +12,7 @@ gr-uhd sanity checking
 
 from gnuradio import gr, gr_unittest, uhd
 
+
 class test_uhd(gr_unittest.TestCase):
 
     def setUp(self):