STINNER Victor <victor.stin...@haypocalc.com> added the comment:

In my experience (PYTHONFSENCODING, sys.setfilesystemencoding()): Python should 
just use the same encoding than the locale encoding because *all* other 
programs on the system use the locale encoding. If none of LANG, LC_ALL or 
LC_CTYPE env var is set: Python does use ASCII just because nl_langinfo() 
answers ASCII.

Said differently: get_codeset() doesn't fail if there is no environment 
variable. If get_codeset() does fail: Python stops immediatly with a fatal 
error, it doesn't fallback to ASCII or something like that.

Python < 3.2 used ASCII at startup until the locale encoding codec was loaded 
(to avoid a bootstrap issue). But I fixed the bootstrap issue in Python 3.2: 
Python does now *always* use the locale encoding, even at startup. Before the 
codec is complelty loaded: Python uses _Py_char2wchar() to decode filenames 
(and other data).

For more information, see also a previous attempt: issue #8725.

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<http://bugs.python.org/issue11574>
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