[issue22016] Add a new 'surrogatereplace' output only error handler

[Nick Coghlan]

Nick Coghlan added the comment:

Stephen Turnbull suggested on python-dev that this was a bad idea, and after reconsidering the current behaviour in Python 2, I realised that setting surrogateescape and letting the terminal deal with the consequences is exactly what we want.

What confused me is that ls replaces the unknown characters with question marks in the C locale:

$ ls
ニコラス.txt
$ LANG=C ls
????????????.txt


Python 2 passes the bytes through, regardless of locale:

$ python -c "import os; print(os.listdir('.')[0])"
ニコラス.txt
$ LANG=C python -c "import os; print(os.listdir('.')[0])"
ニコラス.txt


Current Python 3 gets confused if the C locale is set, as the encoding on sys.stdout gets set to "ascii", which breaks roundtripping:

$ python3 -c "import os; print(os.listdir('.')[0])"
ニコラス.txt                                   
$ LANG=C python3 -c "import os; print(os.listdir('.')[0])"
Traceback (most recent call last):
  File "<string>", line 1, in <module>           
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-11: ordinal not in range(128)

However, Python 3.5 will already set "surrogateescape" on sys.stdout by default, reproducing the behaviour of *Python 2*, rather than the behaviour of ls:
$ LANG=C ~/devel/py3k/python -c "import os; print(os.listdir('.')[0])"
ニコラス.txt

----------
resolution:  -> rejected
stage:  -> resolved
status: open -> closed
type:  -> enhancement

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22016>
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