[issue18818] Empty PYTHONIOENCODING is not the same as nonexistent

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Second variant of the patch also supports empty error handler as the default error handler (i.e. strict).

$ PYTHONIOENCODING=ascii: ./python
Python 3.4.0a1+ (default:5b5ef012cd4e+, Aug 23 2013, 10:18:51) 
[GCC 4.6.3] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> print('\xbd')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeEncodeError: 'ascii' codec can't encode character '\xbd' in position 0: ordinal not in range(128)

Without it different error is raised:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
LookupError: unknown error handler name ''

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Added file: http://bugs.python.org/file31435/empty_pythonioencoding_2.patch

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<http://bugs.python.org/issue18818>
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