12 files changed, 152 insertions, 134 deletions
diff --git a/gr-qtgui/examples/pyqt_const_c.py b/gr-qtgui/examples/pyqt_const_c.py
index 0f3cf60606..9442feb548 100644
--- a/gr-qtgui/examples/pyqt_const_c.py
+++ b/gr-qtgui/examples/pyqt_const_c.py
@@ -32,17 +32,20 @@ except ImportError:
     sys.stderr.write("Error: Program requires gr-channels.\n")
     sys.exit(1)
 
+
 class dialog_box(QtWidgets.QWidget):
     def __init__(self, display, control):
         QtWidgets.QWidget.__init__(self, None)
         self.setWindowTitle('PyQt Test GUI')
 
-        self.boxlayout = QtWidgets.QBoxLayout(QtWidgets.QBoxLayout.LeftToRight, self)
+        self.boxlayout = QtWidgets.QBoxLayout(
+            QtWidgets.QBoxLayout.LeftToRight, self)
         self.boxlayout.addWidget(display, 1)
         self.boxlayout.addWidget(control)
 
         self.resize(800, 500)
 
+
 class control_box(QtWidgets.QWidget):
     def __init__(self, parent=None):
         QtWidgets.QWidget.__init__(self, parent)
@@ -64,14 +67,12 @@ class control_box(QtWidgets.QWidget):
         self.layout.addRow("Signal 1 Amplitude:", self.amp1Edit)
         self.amp1Edit.editingFinished.connect(self.amp1EditText)
 
-
         # Control the second signal
         self.freq2Edit = QtWidgets.QLineEdit(self)
         self.freq2Edit.setMinimumWidth(100)
         self.layout.addRow("Signal 2 Frequency:", self.freq2Edit)
         self.freq2Edit.editingFinished.connect(self.freq2EditText)
 
-
         self.amp2Edit = QtWidgets.QLineEdit(self)
         self.amp2Edit.setMinimumWidth(100)
         self.layout.addRow("Signal 2 Amplitude:", self.amp2Edit)
@@ -106,7 +107,6 @@ class control_box(QtWidgets.QWidget):
         except ValueError:
             print("Bad amplitude value entered")
 
-
     def freq2EditText(self):
         try:
             newfreq = float(self.freq2Edit.text())
@@ -136,22 +136,22 @@ class my_top_block(gr.top_block):
 
         src1 = analog.sig_source_c(Rs, analog.GR_SIN_WAVE, f1, 0.5, 0)
         src2 = analog.sig_source_c(Rs, analog.GR_SIN_WAVE, f2, 0.5, 0)
-        src  = blocks.add_cc()
+        src = blocks.add_cc()
         channel = channels.channel_model(0.001)
-        thr = blocks.throttle(gr.sizeof_gr_complex, 100*npts)
+        thr = blocks.throttle(gr.sizeof_gr_complex, 100 * npts)
         self.snk1 = qtgui.const_sink_c(npts, "Constellation Example", 1, None)
         self.snk1.disable_legend()
 
-        self.connect(src1, (src,0))
-        self.connect(src2, (src,1))
-        self.connect(src,  channel, thr, (self.snk1, 0))
+        self.connect(src1, (src, 0))
+        self.connect(src2, (src, 1))
+        self.connect(src, channel, thr, (self.snk1, 0))
 
         self.ctrl_win = control_box()
         self.ctrl_win.attach_signal1(src1)
         self.ctrl_win.attach_signal2(src2)
 
         # Get the reference pointer to the SpectrumDisplayForm QWidget
-        pyQt  = self.snk1.qwidget()
+        pyQt = self.snk1.qwidget()
 
         # Wrap the pointer as a PyQt SIP object
         # This can now be manipulated as a PyQt5.QtWidgets.QWidget
@@ -160,8 +160,9 @@ class my_top_block(gr.top_block):
         self.main_box = dialog_box(pyWin, self.ctrl_win)
         self.main_box.show()
 
+
 if __name__ == "__main__":
-    tb = my_top_block();
+    tb = my_top_block()
     tb.start()
     tb.qapp.exec_()
     tb.stop()
diff --git a/gr-qtgui/examples/pyqt_example_c.py b/gr-qtgui/examples/pyqt_example_c.py
index 9485c050a8..7ccd42f772 100644
--- a/gr-qtgui/examples/pyqt_example_c.py
+++ b/gr-qtgui/examples/pyqt_example_c.py
@@ -33,17 +33,20 @@ except ImportError:
     sys.stderr.write("Error: Program requires gr-channels.\n")
     sys.exit(1)
 
+
 class dialog_box(QtWidgets.QWidget):
     def __init__(self, display, control):
         QtWidgets.QWidget.__init__(self, None)
         self.setWindowTitle('PyQt Test GUI')
 
-        self.boxlayout = QtWidgets.QBoxLayout(QtWidgets.QBoxLayout.LeftToRight, self)
+        self.boxlayout = QtWidgets.QBoxLayout(
+            QtWidgets.QBoxLayout.LeftToRight, self)
         self.boxlayout.addWidget(display, 1)
         self.boxlayout.addWidget(control)
 
         self.resize(800, 500)
 
+
 class control_box(QtWidgets.QWidget):
     def __init__(self, parent=None):
         QtWidgets.QWidget.__init__(self, parent)
@@ -65,14 +68,12 @@ class control_box(QtWidgets.QWidget):
         self.layout.addRow("Signal 1 Amplitude:", self.amp1Edit)
         self.amp1Edit.editingFinished.connect(self.amp1EditText)
 
-
         # Control the second signal
         self.freq2Edit = QtWidgets.QLineEdit(self)
         self.freq2Edit.setMinimumWidth(100)
         self.layout.addRow("Signal 2 Frequency:", self.freq2Edit)
         self.freq2Edit.editingFinished.connect(self.freq2EditText)
 
-
         self.amp2Edit = QtWidgets.QLineEdit(self)
         self.amp2Edit.setMinimumWidth(100)
         self.layout.addRow("Signal 2 Amplitude:", self.amp2Edit)
@@ -108,7 +109,6 @@ class control_box(QtWidgets.QWidget):
         except ValueError:
             print("Bad amplitude value entered")
 
-
     def freq2EditText(self):
         try:
             newfreq = float(self.freq2Edit.text())
@@ -142,24 +142,24 @@ class my_top_block(gr.top_block):
 
         src1 = analog.sig_source_c(Rs, analog.GR_SIN_WAVE, f1, 0.1, 0)
         src2 = analog.sig_source_c(Rs, analog.GR_SIN_WAVE, f2, 0.1, 0)
-        src  = blocks.add_cc()
+        src = blocks.add_cc()
         channel = channels.channel_model(0.001)
-        thr = blocks.throttle(gr.sizeof_gr_complex, 100*fftsize)
+        thr = blocks.throttle(gr.sizeof_gr_complex, 100 * fftsize)
         self.snk1 = qtgui.sink_c(fftsize, window.WIN_BLACKMAN_hARRIS,
                                  0, Rs,
                                  "Complex Signal Example",
                                  True, True, True, False, None)
 
-        self.connect(src1, (src,0))
-        self.connect(src2, (src,1))
-        self.connect(src,  channel, thr, self.snk1)
+        self.connect(src1, (src, 0))
+        self.connect(src2, (src, 1))
+        self.connect(src, channel, thr, self.snk1)
 
         self.ctrl_win = control_box()
         self.ctrl_win.attach_signal1(src1)
         self.ctrl_win.attach_signal2(src2)
 
         # Get the reference pointer to the SpectrumDisplayForm QWidget
-        pyQt  = self.snk1.qwidget()
+        pyQt = self.snk1.qwidget()
 
         # Wrap the pointer as a PyQt SIP object
         # This can now be manipulated as a PyQt5.QtWidgets.QWidget
@@ -169,8 +169,9 @@ class my_top_block(gr.top_block):
 
         self.main_box.show()
 
+
 if __name__ == "__main__":
-    tb = my_top_block();
+    tb = my_top_block()
     tb.start()
     tb.qapp.exec_()
     tb.stop()
diff --git a/gr-qtgui/examples/pyqt_example_f.py b/gr-qtgui/examples/pyqt_example_f.py
index c8e06b8720..172e51c280 100644
--- a/gr-qtgui/examples/pyqt_example_f.py
+++ b/gr-qtgui/examples/pyqt_example_f.py
@@ -27,17 +27,20 @@ except ImportError:
     sys.stderr.write("Error: Program requires gr-analog.\n")
     sys.exit(1)
 
+
 class dialog_box(QtWidgets.QWidget):
     def __init__(self, display, control):
         QtWidgets.QWidget.__init__(self, None)
         self.setWindowTitle('PyQt Test GUI')
 
-        self.boxlayout = QtWidgets.QBoxLayout(QtWidgets.QBoxLayout.LeftToRight, self)
+        self.boxlayout = QtWidgets.QBoxLayout(
+            QtWidgets.QBoxLayout.LeftToRight, self)
         self.boxlayout.addWidget(display, 1)
         self.boxlayout.addWidget(control)
 
         self.resize(800, 500)
 
+
 class control_box(QtWidgets.QWidget):
     def __init__(self, parent=None):
         QtWidgets.QWidget.__init__(self, parent)
@@ -59,14 +62,12 @@ class control_box(QtWidgets.QWidget):
         self.layout.addRow("Signal 1 Amplitude:", self.amp1Edit)
         self.amp1Edit.editingFinished.connect(self.amp1EditText)
 
-
         # Control the second signal
         self.freq2Edit = QtWidgets.QLineEdit(self)
         self.freq2Edit.setMinimumWidth(100)
         self.layout.addRow("Signal 2 Frequency:", self.freq2Edit)
         self.freq2Edit.editingFinished.connect(self.freq2EditText)
 
-
         self.amp2Edit = QtWidgets.QLineEdit(self)
         self.amp2Edit.setMinimumWidth(100)
         self.layout.addRow("Signal 2 Amplitude:", self.amp2Edit)
@@ -102,7 +103,6 @@ class control_box(QtWidgets.QWidget):
         except ValueError:
             print("Bad amplitude value entered")
 
-
     def freq2EditText(self):
         try:
             newfreq = float(self.freq2Edit.text())
@@ -132,8 +132,8 @@ class my_top_block(gr.top_block):
 
         src1 = analog.sig_source_f(Rs, analog.GR_SIN_WAVE, f1, 0.1, 0)
         src2 = analog.sig_source_f(Rs, analog.GR_SIN_WAVE, f2, 0.1, 0)
-        src  = blocks.add_ff()
-        thr = blocks.throttle(gr.sizeof_float, 100*fftsize)
+        src = blocks.add_ff()
+        thr = blocks.throttle(gr.sizeof_float, 100 * fftsize)
         noise = analog.noise_source_f(analog.GR_GAUSSIAN, 0.001)
         add = blocks.add_ff()
         self.snk1 = qtgui.sink_f(fftsize, window.WIN_BLACKMAN_hARRIS,
@@ -141,10 +141,10 @@ class my_top_block(gr.top_block):
                                  "Float Signal Example",
                                  True, True, True, False, None)
 
-        self.connect(src1, (src,0))
-        self.connect(src2, (src,1))
-        self.connect(src, thr, (add,0))
-        self.connect(noise, (add,1))
+        self.connect(src1, (src, 0))
+        self.connect(src2, (src, 1))
+        self.connect(src, thr, (add, 0))
+        self.connect(noise, (add, 1))
         self.connect(add, self.snk1)
 
         self.ctrl_win = control_box()
@@ -152,7 +152,7 @@ class my_top_block(gr.top_block):
         self.ctrl_win.attach_signal2(src2)
 
         # Get the reference pointer to the SpectrumDisplayForm QWidget
-        pyQt  = self.snk1.qwidget()
+        pyQt = self.snk1.qwidget()
 
         # Wrap the pointer as a PyQt SIP object
         # This can now be manipulated as a PyQt5.QtWidgets.QWidget
@@ -162,8 +162,9 @@ class my_top_block(gr.top_block):
 
         self.main_box.show()
 
+
 if __name__ == "__main__":
-    tb = my_top_block();
+    tb = my_top_block()
     tb.start()
     tb.qapp.exec_()
     tb.stop()
diff --git a/gr-qtgui/examples/pyqt_freq_c.py b/gr-qtgui/examples/pyqt_freq_c.py
index 8f3387befb..5ba641c86f 100644
--- a/gr-qtgui/examples/pyqt_freq_c.py
+++ b/gr-qtgui/examples/pyqt_freq_c.py
@@ -33,17 +33,20 @@ except ImportError:
     sys.stderr.write("Error: Program requires gr-channels.\n")
     sys.exit(1)
 
+
 class dialog_box(QtWidgets.QWidget):
     def __init__(self, display, control):
         QtWidgets.QWidget.__init__(self, None)
         self.setWindowTitle('PyQt Test GUI')
 
-        self.boxlayout = QtWidgets.QBoxLayout(QtWidgets.QBoxLayout.LeftToRight, self)
+        self.boxlayout = QtWidgets.QBoxLayout(
+            QtWidgets.QBoxLayout.LeftToRight, self)
         self.boxlayout.addWidget(display, 1)
         self.boxlayout.addWidget(control)
 
         self.resize(800, 500)
 
+
 class control_box(QtWidgets.QWidget):
     def __init__(self, parent=None):
         QtWidgets.QWidget.__init__(self, parent)
@@ -65,14 +68,12 @@ class control_box(QtWidgets.QWidget):
         self.layout.addRow("Signal 1 Amplitude:", self.amp1Edit)
         self.amp1Edit.editingFinished.connect(self.amp1EditText)
 
-
         # Control the second signal
         self.freq2Edit = QtWidgets.QLineEdit(self)
         self.freq2Edit.setMinimumWidth(100)
         self.layout.addRow("Signal 2 Frequency:", self.freq2Edit)
         self.freq2Edit.editingFinished.connect(self.freq2EditText)
 
-
         self.amp2Edit = QtWidgets.QLineEdit(self)
         self.amp2Edit.setMinimumWidth(100)
         self.layout.addRow("Signal 2 Amplitude:", self.amp2Edit)
@@ -108,7 +109,6 @@ class control_box(QtWidgets.QWidget):
         except ValueError:
             print("Bad amplitude value entered")
 
-
     def freq2EditText(self):
         try:
             newfreq = float(self.freq2Edit.text())
@@ -142,36 +142,37 @@ class my_top_block(gr.top_block):
 
         src1 = analog.sig_source_c(Rs, analog.GR_SIN_WAVE, f1, 0.1, 0)
         src2 = analog.sig_source_c(Rs, analog.GR_SIN_WAVE, f2, 0.1, 0)
-        src  = blocks.add_cc()
+        src = blocks.add_cc()
         channel = channels.channel_model(0.01)
-        thr = blocks.throttle(gr.sizeof_gr_complex, 100*npts)
+        thr = blocks.throttle(gr.sizeof_gr_complex, 100 * npts)
         self.snk1 = qtgui.freq_sink_c(npts, window.WIN_BLACKMAN_hARRIS,
                                       0, Rs,
                                       "Complex Freq Example", 3, None)
 
-        self.connect(src1, (src,0))
-        self.connect(src2, (src,1))
-        self.connect(src,  channel, thr, (self.snk1, 0))
-        self.connect(src1,  (self.snk1, 1))
-        self.connect(src2,  (self.snk1, 2))
+        self.connect(src1, (src, 0))
+        self.connect(src2, (src, 1))
+        self.connect(src, channel, thr, (self.snk1, 0))
+        self.connect(src1, (self.snk1, 1))
+        self.connect(src2, (self.snk1, 2))
 
         self.ctrl_win = control_box()
         self.ctrl_win.attach_signal1(src1)
         self.ctrl_win.attach_signal2(src2)
 
         # Get the reference pointer to the SpectrumDisplayForm QWidget
-        pyQt  = self.snk1.qwidget()
+        pyQt = self.snk1.qwidget()
 
         # Wrap the pointer as a PyQt SIP object
         # This can now be manipulated as a PyQt5.QtWidgets.QWidget
         pyWin = sip.wrapinstance(pyQt, QtWidgets.QWidget)
 
-        #pyWin.show()
+        # pyWin.show()
         self.main_box = dialog_box(pyWin, self.ctrl_win)
         self.main_box.show()
 
+
 if __name__ == "__main__":
-    tb = my_top_block();
+    tb = my_top_block()
     tb.start()
     tb.qapp.exec_()
     tb.stop()
diff --git a/gr-qtgui/examples/pyqt_freq_f.py b/gr-qtgui/examples/pyqt_freq_f.py
index 15949495cc..274e45de7a 100644
--- a/gr-qtgui/examples/pyqt_freq_f.py
+++ b/gr-qtgui/examples/pyqt_freq_f.py
@@ -33,12 +33,14 @@ class dialog_box(QtWidgets.QWidget):
         QtWidgets.QWidget.__init__(self, None)
         self.setWindowTitle('PyQt Test GUI')
 
-        self.boxlayout = QtWidgets.QBoxLayout(QtWidgets.QBoxLayout.LeftToRight, self)
+        self.boxlayout = QtWidgets.QBoxLayout(
+            QtWidgets.QBoxLayout.LeftToRight, self)
         self.boxlayout.addWidget(display, 1)
         self.boxlayout.addWidget(control)
 
         self.resize(800, 500)
 
+
 class control_box(QtWidgets.QWidget):
     def __init__(self, parent=None):
         QtWidgets.QWidget.__init__(self, parent)
@@ -60,14 +62,12 @@ class control_box(QtWidgets.QWidget):
         self.layout.addRow("Signal 1 Amplitude:", self.amp1Edit)
         self.amp1Edit.editingFinished.connect(self.amp1EditText)
 
-
         # Control the second signal
         self.freq2Edit = QtWidgets.QLineEdit(self)
         self.freq2Edit.setMinimumWidth(100)
         self.layout.addRow("Signal 2 Frequency:", self.freq2Edit)
         self.freq2Edit.editingFinished.connect(self.freq2EditText)
 
-
         self.amp2Edit = QtWidgets.QLineEdit(self)
         self.amp2Edit.setMinimumWidth(100)
         self.layout.addRow("Signal 2 Amplitude:", self.amp2Edit)
@@ -103,7 +103,6 @@ class control_box(QtWidgets.QWidget):
         except ValueError:
             print("Bad amplitude value entered")
 
-
     def freq2EditText(self):
         try:
             newfreq = float(self.freq2Edit.text())
@@ -133,35 +132,36 @@ class my_top_block(gr.top_block):
 
         src1 = analog.sig_source_f(Rs, analog.GR_SIN_WAVE, f1, 0.1, 0)
         src2 = analog.sig_source_f(Rs, analog.GR_SIN_WAVE, f2, 0.1, 0)
-        src  = blocks.add_ff()
-        thr = blocks.throttle(gr.sizeof_float, 100*npts)
+        src = blocks.add_ff()
+        thr = blocks.throttle(gr.sizeof_float, 100 * npts)
         self.snk1 = qtgui.freq_sink_f(npts, window.WIN_BLACKMAN_hARRIS,
                                       0, Rs,
                                       "Real freq Example", 3, None)
 
-        self.connect(src1, (src,0))
-        self.connect(src2, (src,1))
-        self.connect(src,  thr, (self.snk1, 0))
-        self.connect(src1,  (self.snk1, 1))
-        self.connect(src2,  (self.snk1, 2))
+        self.connect(src1, (src, 0))
+        self.connect(src2, (src, 1))
+        self.connect(src, thr, (self.snk1, 0))
+        self.connect(src1, (self.snk1, 1))
+        self.connect(src2, (self.snk1, 2))
 
         self.ctrl_win = control_box()
         self.ctrl_win.attach_signal1(src1)
         self.ctrl_win.attach_signal2(src2)
 
         # Get the reference pointer to the SpectrumDisplayForm QWidget
-        pyQt  = self.snk1.qwidget()
+        pyQt = self.snk1.qwidget()
 
         # Wrap the pointer as a PyQt SIP object
         # This can now be manipulated as a PyQt5.QtWidgets.QWidget
         pyWin = sip.wrapinstance(pyQt, QtWidgets.QWidget)
 
-        #pyWin.show()
+        # pyWin.show()
         self.main_box = dialog_box(pyWin, self.ctrl_win)
         self.main_box.show()
 
+
 if __name__ == "__main__":
-    tb = my_top_block();
+    tb = my_top_block()
     tb.start()
     tb.qapp.exec_()
     tb.stop()
diff --git a/gr-qtgui/examples/pyqt_histogram_f.py b/gr-qtgui/examples/pyqt_histogram_f.py
index d35cc90cc9..8360e5aec0 100644
--- a/gr-qtgui/examples/pyqt_histogram_f.py
+++ b/gr-qtgui/examples/pyqt_histogram_f.py
@@ -26,17 +26,20 @@ except ImportError:
     sys.stderr.write("Error: Program requires gr-analog.\n")
     sys.exit(1)
 
+
 class dialog_box(QtWidgets.QWidget):
     def __init__(self, display, control):
         QtWidgets.QWidget.__init__(self, None)
         self.setWindowTitle('PyQt Test GUI')
 
-        self.boxlayout = QtWidgets.QBoxLayout(QtWidgets.QBoxLayout.LeftToRight, self)
+        self.boxlayout = QtWidgets.QBoxLayout(
+            QtWidgets.QBoxLayout.LeftToRight, self)
         self.boxlayout.addWidget(display, 1)
         self.boxlayout.addWidget(control)
 
         self.resize(800, 500)
 
+
 class control_box(QtWidgets.QWidget):
     def __init__(self, snk, parent=None):
         QtWidgets.QWidget.__init__(self, parent)
@@ -59,7 +62,6 @@ class control_box(QtWidgets.QWidget):
         self.layout.addRow("Sine Amplitude:", self.amp1Edit)
         self.amp1Edit.editingFinished.connect(self.amp1EditText)
 
-
         # Control the second signal
         self.amp2Edit = QtWidgets.QLineEdit(self)
         self.amp2Edit.setMinimumWidth(100)
@@ -91,7 +93,6 @@ class control_box(QtWidgets.QWidget):
 
         self.quit.clicked.connect(QtWidgets.qApp.quit)
 
-
     def attach_signal1(self, signal):
         self.signal1 = signal
         self.freq1Edit.setText(("{0}").format(self.signal1.frequency()))
@@ -149,14 +150,14 @@ class my_top_block(gr.top_block):
 
         src1 = analog.sig_source_f(Rs, analog.GR_SIN_WAVE, f1, 0, 0)
         src2 = analog.noise_source_f(analog.GR_GAUSSIAN, 1)
-        src  = blocks.add_ff()
-        thr = blocks.throttle(gr.sizeof_float, 100*npts)
+        src = blocks.add_ff()
+        thr = blocks.throttle(gr.sizeof_float, 100 * npts)
         self.snk1 = qtgui.histogram_sink_f(npts, 200, -5, 5,
                                            "Histogram", 1, None)
         self.snk1.disable_legend()
 
-        self.connect(src1, (src,0))
-        self.connect(src2, (src,1))
+        self.connect(src1, (src, 0))
+        self.connect(src2, (src, 1))
         self.connect(src, thr, self.snk1)
 
         self.ctrl_win = control_box(self.snk1)
@@ -164,18 +165,19 @@ class my_top_block(gr.top_block):
         self.ctrl_win.attach_signal2(src2)
 
         # Get the reference pointer to the SpectrumDisplayForm QWidget
-        pyQt  = self.snk1.qwidget()
+        pyQt = self.snk1.qwidget()
 
         # Wrap the pointer as a PyQt SIP object
         # This can now be manipulated as a PyQt5.QtWidgets.QWidget
         pyWin = sip.wrapinstance(pyQt, QtWidgets.QWidget)
 
-        #pyWin.show()
+        # pyWin.show()
         self.main_box = dialog_box(pyWin, self.ctrl_win)
         self.main_box.show()
 
+
 if __name__ == "__main__":
-    tb = my_top_block();
+    tb = my_top_block()
     tb.start()
     tb.qapp.exec_()
     tb.stop()
diff --git a/gr-qtgui/examples/pyqt_time_c.py b/gr-qtgui/examples/pyqt_time_c.py
index 3a47a6d576..e784b7e4d4 100644
--- a/gr-qtgui/examples/pyqt_time_c.py
+++ b/gr-qtgui/examples/pyqt_time_c.py
@@ -32,17 +32,20 @@ except ImportError:
     sys.stderr.write("Error: Program requires gr-channels.\n")
     sys.exit(1)
 
+
 class dialog_box(QtWidgets.QWidget):
     def __init__(self, display, control):
         QtWidgets.QWidget.__init__(self, None)
         self.setWindowTitle('PyQt Test GUI')
 
-        self.boxlayout = QtWidgets.QBoxLayout(QtWidgets.QBoxLayout.LeftToRight, self)
+        self.boxlayout = QtWidgets.QBoxLayout(
+            QtWidgets.QBoxLayout.LeftToRight, self)
         self.boxlayout.addWidget(display, 1)
         self.boxlayout.addWidget(control)
 
         self.resize(800, 500)
 
+
 class control_box(QtWidgets.QWidget):
     def __init__(self, parent=None):
         QtWidgets.QWidget.__init__(self, parent)
@@ -64,14 +67,12 @@ class control_box(QtWidgets.QWidget):
         self.layout.addRow("Signal 1 Amplitude:", self.amp1Edit)
         self.amp1Edit.editingFinished.connect(self.amp1EditText)
 
-
         # Control the second signal
         self.freq2Edit = QtWidgets.QLineEdit(self)
         self.freq2Edit.setMinimumWidth(100)
         self.layout.addRow("Signal 2 Frequency:", self.freq2Edit)
         self.freq2Edit.editingFinished.connect(self.freq2EditText)
 
-
         self.amp2Edit = QtWidgets.QLineEdit(self)
         self.amp2Edit.setMinimumWidth(100)
         self.layout.addRow("Signal 2 Amplitude:", self.amp2Edit)
@@ -107,7 +108,6 @@ class control_box(QtWidgets.QWidget):
         except ValueError:
             print("Bad amplitude value entered")
 
-
     def freq2EditText(self):
         try:
             newfreq = float(self.freq2Edit.text())
@@ -141,15 +141,15 @@ class my_top_block(gr.top_block):
 
         src1 = analog.sig_source_c(Rs, analog.GR_SIN_WAVE, f1, 0.1, 0)
         src2 = analog.sig_source_c(Rs, analog.GR_SIN_WAVE, f2, 0.1, 0)
-        src  = blocks.add_cc()
+        src = blocks.add_cc()
         channel = channels.channel_model(0.01)
-        thr = blocks.throttle(gr.sizeof_gr_complex, 100*npts)
+        thr = blocks.throttle(gr.sizeof_gr_complex, 100 * npts)
         self.snk1 = qtgui.time_sink_c(npts, Rs,
                                       "Complex Time Example", 1, None)
 
-        self.connect(src1, (src,0))
-        self.connect(src2, (src,1))
-        self.connect(src,  channel, thr, (self.snk1, 0))
+        self.connect(src1, (src, 0))
+        self.connect(src2, (src, 1))
+        self.connect(src, channel, thr, (self.snk1, 0))
         #self.connect(src1, (self.snk1, 1))
         #self.connect(src2, (self.snk1, 2))
 
@@ -158,7 +158,7 @@ class my_top_block(gr.top_block):
         self.ctrl_win.attach_signal2(src2)
 
         # Get the reference pointer to the SpectrumDisplayForm QWidget
-        pyQt  = self.snk1.qwidget()
+        pyQt = self.snk1.qwidget()
 
         # Wrap the pointer as a PyQt SIP object
         # This can now be manipulated as a PyQt5.QtWidgets.QWidget
@@ -166,7 +166,7 @@ class my_top_block(gr.top_block):
 
         # Example of using signal/slot to set the title of a curve
         # FIXME: update for Qt5
-        #pyWin.setLineLabel.connect(pyWin.setLineLabel)
+        # pyWin.setLineLabel.connect(pyWin.setLineLabel)
         #pyWin.emit(QtCore.SIGNAL("setLineLabel(int, QString)"), 0, "Re{sum}")
         self.snk1.set_line_label(0, "Re{Sum}")
         self.snk1.set_line_label(1, "Im{Sum}")
@@ -180,12 +180,13 @@ class my_top_block(gr.top_block):
 
         self.snk1.set_update_time(0.5)
 
-        #pyWin.show()
+        # pyWin.show()
         self.main_box = dialog_box(pyWin, self.ctrl_win)
         self.main_box.show()
 
+
 if __name__ == "__main__":
-    tb = my_top_block();
+    tb = my_top_block()
     tb.start()
     tb.qapp.exec_()
     tb.stop()
diff --git a/gr-qtgui/examples/pyqt_time_f.py b/gr-qtgui/examples/pyqt_time_f.py
index 0bbbfa57d4..2ec181fb56 100644
--- a/gr-qtgui/examples/pyqt_time_f.py
+++ b/gr-qtgui/examples/pyqt_time_f.py
@@ -26,17 +26,20 @@ except ImportError:
     sys.stderr.write("Error: Program requires gr-analog.\n")
     sys.exit(1)
 
+
 class dialog_box(QtWidgets.QWidget):
     def __init__(self, display, control):
         QtWidgets.QWidget.__init__(self, None)
         self.setWindowTitle('PyQt Test GUI')
 
-        self.boxlayout = QtWidgets.QBoxLayout(QtWidgets.QBoxLayout.LeftToRight, self)
+        self.boxlayout = QtWidgets.QBoxLayout(
+            QtWidgets.QBoxLayout.LeftToRight, self)
         self.boxlayout.addWidget(display, 1)
         self.boxlayout.addWidget(control)
 
         self.resize(800, 500)
 
+
 class control_box(QtWidgets.QWidget):
     def __init__(self, parent=None):
         QtWidgets.QWidget.__init__(self, parent)
@@ -58,14 +61,12 @@ class control_box(QtWidgets.QWidget):
         self.layout.addRow("Signal 1 Amplitude:", self.amp1Edit)
         self.amp1Edit.editingFinished.connect(self.amp1EditText)
 
-
         # Control the second signal
         self.freq2Edit = QtWidgets.QLineEdit(self)
         self.freq2Edit.setMinimumWidth(100)
         self.layout.addRow("Signal 2 Frequency:", self.freq2Edit)
         self.freq2Edit.editingFinished.connect(self.freq2EditText)
 
-
         self.amp2Edit = QtWidgets.QLineEdit(self)
         self.amp2Edit.setMinimumWidth(100)
         self.layout.addRow("Signal 2 Amplitude:", self.amp2Edit)
@@ -101,7 +102,6 @@ class control_box(QtWidgets.QWidget):
         except ValueError:
             print("Bad amplitude value entered")
 
-
     def freq2EditText(self):
         try:
             newfreq = float(self.freq2Edit.text())
@@ -131,17 +131,17 @@ class my_top_block(gr.top_block):
 
         src1 = analog.sig_source_f(Rs, analog.GR_SIN_WAVE, f1, 0.1, 0)
         src2 = analog.sig_source_f(Rs, analog.GR_SIN_WAVE, f2, 0.1, 0)
-        src  = blocks.add_ff()
-        thr = blocks.throttle(gr.sizeof_float, 100*npts)
+        src = blocks.add_ff()
+        thr = blocks.throttle(gr.sizeof_float, 100 * npts)
         noise = analog.noise_source_f(analog.GR_GAUSSIAN, 0.001)
         add = blocks.add_ff()
         self.snk1 = qtgui.time_sink_f(npts, Rs,
                                       "Complex Time Example", 3, None)
 
-        self.connect(src1, (src,0))
-        self.connect(src2, (src,1))
-        self.connect(src, thr, (add,0))
-        self.connect(noise, (add,1))
+        self.connect(src1, (src, 0))
+        self.connect(src2, (src, 1))
+        self.connect(src, thr, (add, 0))
+        self.connect(noise, (add, 1))
         self.connect(add, self.snk1)
         self.connect(src1, (self.snk1, 1))
         self.connect(src2, (self.snk1, 2))
@@ -151,7 +151,7 @@ class my_top_block(gr.top_block):
         self.ctrl_win.attach_signal2(src2)
 
         # Get the reference pointer to the SpectrumDisplayForm QWidget
-        pyQt  = self.snk1.qwidget()
+        pyQt = self.snk1.qwidget()
 
         # Wrap the pointer as a PyQt SIP object
         # This can now be manipulated as a PyQt5.QtWidgets.QWidget
@@ -159,7 +159,7 @@ class my_top_block(gr.top_block):
 
         # Example of using signal/slot to set the title of a curve
         # FIXME: update for Qt5
-        #pyWin.setLineLabel.connect(pyWin.setLineLabel)
+        # pyWin.setLineLabel.connect(pyWin.setLineLabel)
         #pyWin.emit(QtCore.SIGNAL("setLineLabel(int, QString)"), 0, "Re{sum}")
         self.snk1.set_line_label(0, "Re{sum}")
         self.snk1.set_line_label(1, "src1")
@@ -168,12 +168,13 @@ class my_top_block(gr.top_block):
         # Can also set the color of a curve
         #self.snk1.set_color(5, "blue")
 
-        #pyWin.show()
+        # pyWin.show()
         self.main_box = dialog_box(pyWin, self.ctrl_win)
         self.main_box.show()
 
+
 if __name__ == "__main__":
-    tb = my_top_block();
+    tb = my_top_block()
     tb.start()
     tb.qapp.exec_()
     tb.stop()
diff --git a/gr-qtgui/examples/pyqt_time_raster_b.py b/gr-qtgui/examples/pyqt_time_raster_b.py
index 712fe39567..25c283385b 100644
--- a/gr-qtgui/examples/pyqt_time_raster_b.py
+++ b/gr-qtgui/examples/pyqt_time_raster_b.py
@@ -21,25 +21,28 @@ except ImportError:
     print("Error: Program requires PyQt5 and gr-qtgui.")
     sys.exit(1)
 
+
 class dialog_box(QtWidgets.QWidget):
     def __init__(self, display):
         QtWidgets.QWidget.__init__(self, None)
         self.setWindowTitle('PyQt Test GUI')
 
-        self.boxlayout = QtWidgets.QBoxLayout(QtWidgets.QBoxLayout.LeftToRight, self)
+        self.boxlayout = QtWidgets.QBoxLayout(
+            QtWidgets.QBoxLayout.LeftToRight, self)
         self.boxlayout.addWidget(display, 1)
 
         self.resize(800, 500)
 
+
 class my_top_block(gr.top_block):
     def __init__(self):
         gr.top_block.__init__(self)
 
         self.qapp = QtWidgets.QApplication(sys.argv)
 
-        data0  = 10*[0,] + 40*[1,0] + 10*[0,]
-        data0 += 10*[0,] + 40*[0,1] + 10*[0,]
-        data1 = 20*[0,] + [0,0,0,1,1,1,0,0,0,0] + 70*[0,]
+        data0 = 10 * [0, ] + 40 * [1, 0] + 10 * [0, ]
+        data0 += 10 * [0, ] + 40 * [0, 1] + 10 * [0, ]
+        data1 = 20 * [0, ] + [0, 0, 0, 1, 1, 1, 0, 0, 0, 0] + 70 * [0, ]
 
         # Adjust these to change the layout of the plot.
         # Can be set to fractions.
@@ -49,7 +52,7 @@ class my_top_block(gr.top_block):
         fs = 200
         src0 = blocks.vector_source_b(data0, True)
         src1 = blocks.vector_source_b(data1, True)
-        thr  = blocks.throttle(gr.sizeof_char, 50000)
+        thr = blocks.throttle(gr.sizeof_char, 50000)
         head = blocks.head(gr.sizeof_char, 10000000)
         self.snk1 = qtgui.time_raster_sink_b(fs, nrows, ncols, [], [],
                                              "Time Raster Example", 2, None)
@@ -67,8 +70,9 @@ class my_top_block(gr.top_block):
         self.main_box = dialog_box(pyWin)
         self.main_box.show()
 
+
 if __name__ == "__main__":
-    tb = my_top_block();
+    tb = my_top_block()
     tb.start()
     tb.qapp.exec_()
     tb.stop()
diff --git a/gr-qtgui/examples/pyqt_time_raster_f.py b/gr-qtgui/examples/pyqt_time_raster_f.py
index aa4e4a8000..a86b7c910e 100644
--- a/gr-qtgui/examples/pyqt_time_raster_f.py
+++ b/gr-qtgui/examples/pyqt_time_raster_f.py
@@ -20,25 +20,28 @@ except ImportError:
     print("Error: Program requires PyQt5 and gr-qtgui.")
     sys.exit(1)
 
+
 class dialog_box(QtWidgets.QWidget):
     def __init__(self, display):
         QtWidgets.QWidget.__init__(self, None)
         self.setWindowTitle('PyQt Test GUI')
 
-        self.boxlayout = QtWidgets.QBoxLayout(QtWidgets.QBoxLayout.LeftToRight, self)
+        self.boxlayout = QtWidgets.QBoxLayout(
+            QtWidgets.QBoxLayout.LeftToRight, self)
         self.boxlayout.addWidget(display, 1)
 
         self.resize(800, 500)
 
+
 class my_top_block(gr.top_block):
     def __init__(self):
         gr.top_block.__init__(self)
 
         self.qapp = QtWidgets.QApplication(sys.argv)
 
-        data0  = 10*[0,] + 40*[1,0] + 10*[0,]
-        data0 += 10*[0,] + 40*[0,1] + 10*[0,]
-        data1 = 20*[0,] + [0,0,0,1,1,1,0,0,0,0] + 70*[0,]
+        data0 = 10 * [0, ] + 40 * [1, 0] + 10 * [0, ]
+        data0 += 10 * [0, ] + 40 * [0, 1] + 10 * [0, ]
+        data1 = 20 * [0, ] + [0, 0, 0, 1, 1, 1, 0, 0, 0, 0] + 70 * [0, ]
 
         # Adjust these to change the layout of the plot.
         # Can be set to fractions.
@@ -66,8 +69,9 @@ class my_top_block(gr.top_block):
         self.main_box = dialog_box(pyWin)
         self.main_box.show()
 
+
 if __name__ == "__main__":
-    tb = my_top_block();
+    tb = my_top_block()
     tb.start()
     tb.qapp.exec_()
     tb.stop()
diff --git a/gr-qtgui/examples/pyqt_waterfall_c.py b/gr-qtgui/examples/pyqt_waterfall_c.py
index a3bf5282cb..778a91ead9 100644
--- a/gr-qtgui/examples/pyqt_waterfall_c.py
+++ b/gr-qtgui/examples/pyqt_waterfall_c.py
@@ -33,17 +33,20 @@ except ImportError:
     sys.stderr.write("Error: Program requires gr-channels.\n")
     sys.exit(1)
 
+
 class dialog_box(QtWidgets.QWidget):
     def __init__(self, display, control):
         QtWidgets.QWidget.__init__(self, None)
         self.setWindowTitle('PyQt Test GUI')
 
-        self.boxlayout = QtWidgets.QBoxLayout(QtWidgets.QBoxLayout.LeftToRight, self)
+        self.boxlayout = QtWidgets.QBoxLayout(
+            QtWidgets.QBoxLayout.LeftToRight, self)
         self.boxlayout.addWidget(display, 1)
         self.boxlayout.addWidget(control)
 
         self.resize(800, 500)
 
+
 class control_box(QtWidgets.QWidget):
     def __init__(self, parent=None):
         QtWidgets.QWidget.__init__(self, parent)
@@ -65,14 +68,12 @@ class control_box(QtWidgets.QWidget):
         self.layout.addRow("Signal 1 Amplitude:", self.amp1Edit)
         self.amp1Edit.editingFinished.connect(self.amp1EditText)
 
-
         # Control the second signal
         self.freq2Edit = QtWidgets.QLineEdit(self)
         self.freq2Edit.setMinimumWidth(100)
         self.layout.addRow("Signal 2 Frequency:", self.freq2Edit)
         self.freq2Edit.editingFinished.connect(self.freq2EditText)
 
-
         self.amp2Edit = QtWidgets.QLineEdit(self)
         self.amp2Edit.setMinimumWidth(100)
         self.layout.addRow("Signal 2 Amplitude:", self.amp2Edit)
@@ -108,7 +109,6 @@ class control_box(QtWidgets.QWidget):
         except ValueError:
             print("Bad amplitude value entered")
 
-
     def freq2EditText(self):
         try:
             newfreq = float(self.freq2Edit.text())
@@ -144,9 +144,9 @@ class my_top_block(gr.top_block):
 
         src1 = analog.sig_source_c(Rs, analog.GR_SIN_WAVE, f1, 0.1, 0)
         src2 = analog.sig_source_c(Rs, analog.GR_SIN_WAVE, f2, 0.1, 0)
-        src  = blocks.add_cc()
+        src = blocks.add_cc()
         channel = channels.channel_model(0.01)
-        thr = blocks.throttle(gr.sizeof_gr_complex, 100*npts)
+        thr = blocks.throttle(gr.sizeof_gr_complex, 100 * npts)
         filt = filter.fft_filter_ccc(1, taps)
         self.snk1 = qtgui.waterfall_sink_c(npts, window.WIN_BLACKMAN_hARRIS,
                                            0, Rs,
@@ -154,9 +154,9 @@ class my_top_block(gr.top_block):
         self.snk1.set_color_map(0, qtgui.INTENSITY_COLOR_MAP_TYPE_COOL)
         self.snk1.set_color_map(1, qtgui.INTENSITY_COLOR_MAP_TYPE_COOL)
 
-        self.connect(src1, (src,0))
-        self.connect(src2, (src,1))
-        self.connect(src,  channel, thr, (self.snk1, 0))
+        self.connect(src1, (src, 0))
+        self.connect(src2, (src, 1))
+        self.connect(src, channel, thr, (self.snk1, 0))
         self.connect(thr, filt, (self.snk1, 1))
 
         self.ctrl_win = control_box()
@@ -164,18 +164,19 @@ class my_top_block(gr.top_block):
         self.ctrl_win.attach_signal2(src2)
 
         # Get the reference pointer to the SpectrumDisplayForm QWidget
-        pyQt  = self.snk1.qwidget()
+        pyQt = self.snk1.qwidget()
 
         # Wrap the pointer as a PyQt SIP object
         # This can now be manipulated as a PyQt5.QtWidgets.QWidget
         pyWin = sip.wrapinstance(pyQt, QtWidgets.QWidget)
 
-        #pyWin.show()
+        # pyWin.show()
         self.main_box = dialog_box(pyWin, self.ctrl_win)
         self.main_box.show()
 
+
 if __name__ == "__main__":
-    tb = my_top_block();
+    tb = my_top_block()
     tb.start()
     tb.qapp.exec_()
     tb.stop()
diff --git a/gr-qtgui/examples/pyqt_waterfall_f.py b/gr-qtgui/examples/pyqt_waterfall_f.py
index 15e0512df4..ecbe84dee5 100644
--- a/gr-qtgui/examples/pyqt_waterfall_f.py
+++ b/gr-qtgui/examples/pyqt_waterfall_f.py
@@ -27,17 +27,20 @@ except ImportError:
     sys.stderr.write("Error: Program requires gr-analog.\n")
     sys.exit(1)
 
+
 class dialog_box(QtWidgets.QWidget):
     def __init__(self, display, control):
         QtWidgets.QWidget.__init__(self, None)
         self.setWindowTitle('PyQt Test GUI')
 
-        self.boxlayout = QtWidgets.QBoxLayout(QtWidgets.QBoxLayout.LeftToRight, self)
+        self.boxlayout = QtWidgets.QBoxLayout(
+            QtWidgets.QBoxLayout.LeftToRight, self)
         self.boxlayout.addWidget(display, 1)
         self.boxlayout.addWidget(control)
 
         self.resize(800, 500)
 
+
 class control_box(QtWidgets.QWidget):
     def __init__(self, parent=None):
         QtWidgets.QWidget.__init__(self, parent)
@@ -59,14 +62,12 @@ class control_box(QtWidgets.QWidget):
         self.layout.addRow("Signal 1 Amplitude:", self.amp1Edit)
         self.amp1Edit.editingFinished.connect(self.amp1EditText)
 
-
         # Control the second signal
         self.freq2Edit = QtWidgets.QLineEdit(self)
         self.freq2Edit.setMinimumWidth(100)
         self.layout.addRow("Signal 2 Frequency:", self.freq2Edit)
         self.freq2Edit.editingFinished.connect(self.freq2EditText)
 
-
         self.amp2Edit = QtWidgets.QLineEdit(self)
         self.amp2Edit.setMinimumWidth(100)
         self.layout.addRow("Signal 2 Amplitude:", self.amp2Edit)
@@ -102,7 +103,6 @@ class control_box(QtWidgets.QWidget):
         except ValueError:
             print("Bad amplitude value entered")
 
-
     def freq2EditText(self):
         try:
             newfreq = float(self.freq2Edit.text())
@@ -132,17 +132,17 @@ class my_top_block(gr.top_block):
 
         src1 = analog.sig_source_f(Rs, analog.GR_SIN_WAVE, f1, 0.1, 0)
         src2 = analog.sig_source_f(Rs, analog.GR_SIN_WAVE, f2, 0.1, 0)
-        src  = blocks.add_ff()
-        thr = blocks.throttle(gr.sizeof_float, 100*npts)
+        src = blocks.add_ff()
+        thr = blocks.throttle(gr.sizeof_float, 100 * npts)
         self.snk1 = qtgui.waterfall_sink_f(npts, window.WIN_BLACKMAN_hARRIS,
                                            0, Rs,
                                            "Real Waterfall Example", 2, None)
         self.snk1.set_color_map(0, qtgui.INTENSITY_COLOR_MAP_TYPE_COOL)
         self.snk1.set_color_map(1, qtgui.INTENSITY_COLOR_MAP_TYPE_COOL)
 
-        self.connect(src1, (src,0))
-        self.connect(src2, (src,1))
-        self.connect(src,  thr, (self.snk1, 0))
+        self.connect(src1, (src, 0))
+        self.connect(src2, (src, 1))
+        self.connect(src, thr, (self.snk1, 0))
         self.connect(src1, (self.snk1, 1))
 
         self.ctrl_win = control_box()
@@ -150,18 +150,19 @@ class my_top_block(gr.top_block):
         self.ctrl_win.attach_signal2(src2)
 
         # Get the reference pointer to the SpectrumDisplayForm QWidget
-        pyQt  = self.snk1.qwidget()
+        pyQt = self.snk1.qwidget()
 
         # Wrap the pointer as a PyQt SIP object
         # This can now be manipulated as a PyQt5.QtWidgets.QWidget
         pyWin = sip.wrapinstance(pyQt, QtWidgets.QWidget)
 
-        #pyWin.show()
+        # pyWin.show()
         self.main_box = dialog_box(pyWin, self.ctrl_win)
         self.main_box.show()
 
+
 if __name__ == "__main__":
-    tb = my_top_block();
+    tb = my_top_block()
     tb.start()
     tb.qapp.exec_()
     tb.stop()