[issue1367711] Remove usage of UserDict from os.py
Andrew Dalke
report at bugs.python.org
Sat Jan 12 12:30:55 CET 2008
Andrew Dalke added the comment:
I was optimization tuning and wondered why UserDict was imported by os. Replacing
UserDict with dict passes all existing regression tests.
I see the concerns that doing that replacement is not future proof. Strange then
that Cookie.py is acceptable. There are three places in Lib which derive from dict,
and two are in Cookie.py and in both cases it's broken because set_default does not
go through the same checks that __setitem__ goes through.
(The other place is an internal class in _strptime.)
In looking over existing third-party code, I see this nuance of when to use UserDict
vs. dict isn't that well known. The documentation says "The need for this class has
been largely supplanted by the ability to subclass directly from dict", but that
isn't true if anyone is worried about future-proofing and where the subclass changes
one of the standard methods.
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nosy: +dalke
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