Marc-Andre Lemburg <m...@egenix.com> added the comment:
Hi Jason,
to achieve better backwards compatibility, it's probably better to use
the approach taken for CodeInfo in the codecs.py module:
class CodecInfo(tuple):
"""Codec details when looking up the codec registry"""
def __new__(cls, encode, decode, streamreader=None, streamwriter=None,
incrementalencoder=None, incrementaldecoder=None, name=None,
*, _is_text_encoding=None):
self = tuple.__new__(cls, (encode, decode, streamreader,
streamwriter))
self.name = name
self.encode = encode
self.decode = decode
self.incrementalencoder = incrementalencoder
self.incrementaldecoder = incrementaldecoder
self.streamwriter = streamwriter
self.streamreader = streamreader
if _is_text_encoding is not None:
self._is_text_encoding = _is_text_encoding
return self
def __repr__(self):
return "<%s.%s object for encoding %s at %#x>" % \
(self.__class__.__module__, self.__class__.__qualname__,
self.name, id(self))
This used to be a 4 entry tuple and was extended to hold additional
fields. To the outside, it still looks like a 4-tuple in all aspects,
but attribute access permits accessing the additional fields.
--
Marc-Andre Lemburg
eGenix.com
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<https://bugs.python.org/issue40570>
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