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This is Victor Stinner's pure-Python implementation of PEP 383: the "surrogateescape" error
handler of Python 3.
Source: misc/python/surrogateescape.py in https://bitbucket.org/haypo/misc
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Pure Python implementation of the PEP 383: the "surrogateescape" error
handler of Python 3. Undecodable bytes will be replaced by a Unicode
character U+DCxx on decoding, and these are translated into the
original bytes on encoding.
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Returns a (unicode) string, not the more logical bytes, because the codecs
register_error functionality expects this.
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Registers the surrogateescape error handler on Python 2 (only)
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