diff options
Diffstat (limited to 'Doc/library/codecs.rst')
| -rw-r--r-- | Doc/library/codecs.rst | 42 |
1 files changed, 26 insertions, 16 deletions
diff --git a/Doc/library/codecs.rst b/Doc/library/codecs.rst index c3e7407..21e74ca 100644 --- a/Doc/library/codecs.rst +++ b/Doc/library/codecs.rst @@ -53,7 +53,7 @@ It defines the following functions: *incrementalencoder* and *incrementaldecoder*: These have to be factory functions providing the following interface: - ``factory(errors='strict')`` + ``factory(errors='strict')`` The factory functions must return objects providing the interfaces defined by the base classes :class:`IncrementalEncoder` and :class:`IncrementalDecoder`, @@ -62,21 +62,25 @@ It defines the following functions: *streamreader* and *streamwriter*: These have to be factory functions providing the following interface: - ``factory(stream, errors='strict')`` + ``factory(stream, errors='strict')`` The factory functions must return objects providing the interfaces defined by the base classes :class:`StreamWriter` and :class:`StreamReader`, respectively. Stream codecs can maintain state. - Possible values for errors are ``'strict'`` (raise an exception in case of an - encoding error), ``'replace'`` (replace malformed data with a suitable - replacement marker, such as ``'?'``), ``'ignore'`` (ignore malformed data and - continue without further notice), ``'xmlcharrefreplace'`` (replace with the - appropriate XML character reference (for encoding only)), - ``'backslashreplace'`` (replace with backslashed escape sequences (for - encoding only)), ``'surrogateescape'`` (replace with surrogate U+DCxx, see - :pep:`383`) as well as any other error handling name defined via - :func:`register_error`. + Possible values for errors are + + * ``'strict'``: raise an exception in case of an encoding error + * ``'replace'``: replace malformed data with a suitable replacement marker, + such as ``'?'`` or ``'\ufffd'`` + * ``'ignore'``: ignore malformed data and continue without further notice + * ``'xmlcharrefreplace'``: replace with the appropriate XML character + reference (for encoding only) + * ``'backslashreplace'``: replace with backslashed escape sequences (for + encoding only + * ``'surrogateescape'``: replace with surrogate U+DCxx, see :pep:`383` + + as well as any other error handling name defined via :func:`register_error`. In case a search function cannot find a given encoding, it should return ``None``. @@ -173,27 +177,33 @@ functions which use :func:`lookup` for the codec lookup: .. function:: strict_errors(exception) - Implements the ``strict`` error handling. + Implements the ``strict`` error handling: each encoding or decoding error + raises a :exc:`UnicodeError`. .. function:: replace_errors(exception) - Implements the ``replace`` error handling. + Implements the ``replace`` error handling: malformed data is replaced with a + suitable replacement character such as ``'?'`` in bytestrings and + ``'\ufffd'`` in Unicode strings. .. function:: ignore_errors(exception) - Implements the ``ignore`` error handling. + Implements the ``ignore`` error handling: malformed data is ignored and + encoding or decoding is continued without further notice. .. function:: xmlcharrefreplace_errors(exception) - Implements the ``xmlcharrefreplace`` error handling. + Implements the ``xmlcharrefreplace`` error handling (for encoding only): the + unencodable character is replaced by an appropriate XML character reference. .. function:: backslashreplace_errors(exception) - Implements the ``backslashreplace`` error handling. + Implements the ``backslashreplace`` error handling (for encoding only): the + unencodable character is replaced by a backslashed escape sequence. To simplify working with encoded files or stream, the module also defines these utility functions: |