Keep imports alphabetically sorted and their order homogeneous across
Python source files.
The isort project has more feature and is more active than the
flake8-import-order plugin.
Most issues caught were simply import ordering from the same module.
Where imports were purposefully placed out of order, tag with
isort:skip.
In development of 3.0, Sphinx starts to obey to the rule of
"Identifier Normalization" of docutils. This extends it to allow
dots(".") and underscores("_") for node identifier.
It allows Sphinx to generate node identifier from source string as
possible as it is (bacause dots and underscores are usually used in
many programming langauges).
This change will keep not to break hyperlinks as possible.
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.
Instead rely on docutils’ ‘smart_quotes’ option which is available
since docutils 0.10.
This adds support for internationalization: our code supported only
English quotes, while docutils code supports 27 different languages.
Closes#498, #580, #3345, #3472.
