[issue8622] Add PYTHONFSENCODING environment variable

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> > Oh, I realized that PYTHONFSENCODING is ignored on Windows and Mac OS X.
> > r84201 and r84202 fix test_sys, and r84203 fixes the documentation and
> > Python usage (hide PYTHONFSENCODING variable in Python help on Windows
> > and Mac OS X).
> 
> This has to be changed: The env var needs to be respected on all
> platforms.

I don't think so.

On Mac OS X, you cannot create a file with an invalid utf-8 name. The VFS uses 
utf-8:
http://developer.apple.com/mac/library/qa/qa2001/qa1173.html

Use a different encoding will raise error for the first non-ascii filename.

--

About Windows, Python3 uses the wide character API of Windows, except in some 
functions using third party libraries only providing a bytes API (eg. 
openssl). filenames are stored as unicode, even on removable media like CD-Rom 
or USB keys. I don't get the usecase here. Why would you like to change the 
filesystem encoding on Windows?

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