flake8: add setup.cfg & fix existing issues

Author: andreasmueller

python/wisun/__init__.py

@@ -10,12 +10,11 @@
 This is the GNU Radio WISUN module. Place your Python package
 description here (python/__init__.py).
 '''
-import os
 
 # import pybind11 generated symbols into the wisun namespace
 try:
     # this might fail if the module is python-only
-    from .wisun_python import *
+    from .wisun_python import *  # noqa
 except ModuleNotFoundError:
     pass
 

setup.cfg

@@ -0,0 +1,16 @@
+[flake8]
+# See
+# - flake8 error codes: https://flake8.pycqa.org/en/latest/user/error-codes.html
+# - pycodestyle error codes: https://pep8.readthedocs.io/en/latest/intro.html#error-codes
+#
+# ⇒ nothing disabled; we're fully pep8 compatible
+max-line-length=120
+
+[pycodestyle]
+# for using pycodestyle directly; same as for flake8 and
+# additionally (because pycodestyle ignores 'noqa'):
+#
+# W504: line break after binary operator 
+# E241: multiple spaces after ',' (prevents nice formatting in some cases)
+ignore=W504,E241
+max-line-length=120