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document that encoding error handlers may return bytes (#16585)

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Benjamin Peterson 2012-12-02 11:26:10 -05:00
parent 47a00f3d1a
commit 196035595f
1 changed files with 10 additions and 7 deletions
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Doc/library/codecs.rst
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@ -155,13 +155,16 @@ functions which use :func:`lookup` for the codec lookup:
when *name* is specified as the errors parameter.
For encoding *error_handler* will be called with a :exc:`UnicodeEncodeError`
instance, which contains information about the location of the error. The error
handler must either raise this or a different exception or return a tuple with a
replacement for the unencodable part of the input and a position where encoding
should continue. The encoder will encode the replacement and continue encoding
the original input at the specified position. Negative position values will be
treated as being relative to the end of the input string. If the resulting
position is out of bound an :exc:`IndexError` will be raised.
instance, which contains information about the location of the error. The
error handler must either raise this or a different exception or return a
tuple with a replacement for the unencodable part of the input and a position
where encoding should continue. The replacement may be either :class:`str` or
:class:`bytes`. If the replacement is bytes, the encoder will simply copy
them into the output buffer. If the replacement is a string, the encoder will
encode the replacement. Encoding continues on original input at the
specified position. Negative position values will be treated as being
relative to the end of the input string. If the resulting position is out of
bound an :exc:`IndexError` will be raised.
Decoding and translating works similar, except :exc:`UnicodeDecodeError` or
:exc:`UnicodeTranslateError` will be passed to the handler and that the