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Signed-off-by: Josh Morman <jmorman@gnuradio.org>
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All of the removed `from __future__ import` were needed in older
versions of Python (mostly 2.5.x and below) but later became mandatory
in most versions of Python 3 hence are not necessary anymore.
More specifically, according to __future__.py[1]:
- unicode_literals is part of Python since versions 2.6.0 and 3.0.0;
- print_function is part of Python since versions 2.6.0 and 3.0.0;
- absolute_import is part of Python since versions 2.5.0 and 3.0.0;
- division is part of Python since versions 2.2.0 and 3.0.0;
Get rid of those unnecessary imports to slightly clean up the codebase.
[1] https://github.com/python/cpython/blob/master/Lib/__future__.py
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Also added an example, usrp_sink_controller.py, to excercise this
feature. Fixed up the source example, too, to better manage parsing
options and setting the UHD source block alias (defaults to 'gr uhd
usrp source0', which is the default for any flowgraph with a single
UHD source block).
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Explore simple cases of passing messages to message handlers over
controlport. Installed into standard examples directory.
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