Since python3.5, subprocess.run() has been introduced. It works a wrapper of Popen, and it looks much simple and better. This uses it instead of Popen to make our code simple.
In Python 3, the default encoding of source files is utf-8. The encoding cookie is now unnecessary and redundant so remove it. For more details, see the docs: https://docs.python.org/3/howto/unicode.html#the-string-type > The default encoding for Python source code is UTF-8, so you can > simply include a Unicode character in a string literal ... Includes a fix for the flake8 header checks to stop expecting an encoding cookie.