The default encoding of Python sources is UTF-8

[DimitriPapadopoulos]

Summary of changes

Python 3 assumes the encoding is UTF-8 by default, and so do or should do tools such as text editors when opening Python files.

No need to explicitly set *- coding: utf-8 -*-.

Pull Request Checklist

• Changes have tests
• News fragment added in [changelog.d/].
  (See [documentation][PR docs] for details)

[DimitriPapadopoulos]

Besides, most of these files contain only ASCII characters:

$ file docs/conf.py setuptools/command/upload_docs.py setuptools/dist.py setuptools/tests/script-with-bom.py setuptools/tests/test_manifest.py setuptools/tests/test_msvc14.py setuptools/tests/test_wheel.py 
docs/conf.py:                        Python script, ASCII text executable
setuptools/command/upload_docs.py:   Python script, ASCII text executable
setuptools/dist.py:                  Python script, ASCII text executable
setuptools/tests/script-with-bom.py: Unicode text, UTF-8 (with BOM) text
setuptools/tests/test_manifest.py:   Python script, ASCII text executable
setuptools/tests/test_msvc14.py:     Python script, Unicode text, UTF-8 text executable
setuptools/tests/test_wheel.py:      Python script, Unicode text, UTF-8 text executable
$ 

[abravalheri]

Thanks Dimitri!