[issue40570] len(platform.uname()) has changed in Python 3.9

[Marc-Andre Lemburg]

Marc-Andre Lemburg <mal at 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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