callable() from copy_reg.py, so the interpreter now starts up
without warnings when '-3' is given. More work like this needs to
be done in the rest of the stdlib.
- The copy module now "copies" function objects (as atomic objects).
- dict.__getitem__ now looks for a __missing__ hook before raising
KeyError.
- Added a new type, defaultdict, to the collections module.
This uses the new __missing__ hook behavior added to dict (see above).
(Championed by Bob Ippolito.)
The update() method for mappings now accepts all the same argument forms
as the dict() constructor. This includes item lists and/or keyword
arguments.
Sebastien Keim pointed out that iterkeys and __contains__ require
their own definitions so their behavior will update when the
underlying method is subclassed.
Constructor accepts optional keyword arguments after a optional items list.
Add fromkeys() as an alternate constructor from an iterable over keys.
Expand related unittests.
Already supported dict() and dict(mapping).
Now supports dict(itemsequence) and
Just van Rossum's new syntax for dict(keywordargs).
Also, added related unittests.
The docs already promise dict-like behavior
so no update is needed there.
Replaced docstring with comments. Prevents subclass contamination.
Added the missing __cmp__() method and a test for __cmp__().
Used try/except style in preference to has_key() followed by a look-up.
Used iteritem() where possible to save creating a long key list and
to save redundant lookups.
Expanded .update() to look for the most helpful methods first and gradually
work down to a mininum expected interface.
Expanded documentation to be more clear on how to use the class.
break old code (in extreme cases). See SF bug #448153.
Add a new subclass IterableUserDict that has the __iter__ method.
Note that for new projects, unless backwards compatibility with
pre-2.2 Python is required, subclassing 'dictionary' is recommended;
UserDict might become deprecated.
