Add this default to weakref.WeakValueDictionary.setdefault()
and weakref.WeakKeyDictionary.setdefault() too.

Add this default to UserDict.DictMixin.setdefault() too.

[ 899109 ] 1==float('nan')

which can now finally be closed, I think.

[ 728330 ] Don't define _SGAPI on IRIX

The Right Thing would be nice, for now this'll do.  At least it isn't
going to break anything *other* than IRIX...

readline module is loaded.

* rename a variable for clarity

* Factored out common code to a single private function.
* Use str.join() instead of + concatenation
* Loop over elements directly instead of using indexing
* Use % operator for formatting

expression.

* Put in a brief, example driven tutorial entry.
* Use better examples in whatsnew24.tex.

Set data pointer to NULL after an error; this keeps the mmap_dealloc() function from trying to do msync(-1);munmap(-1).
2.3 bugfix candidate, but this bug isn't critical enough that the fix has to go into 2.3.4

(Code contributed by Jiwon Seo.)

The documentation portion of the patch is being re-worked and will be
checked-in soon.  Likewise, PEP 289 will be updated to reflect Guido's
rationale for the design decisions on binding behavior (as described in
in his patch comments and in discussions on python-dev).

The test file, test_genexps.py, is written in doctest format and is
meant to exercise all aspects of the the patch.  Further additions are
welcome from everyone.  Please stress test this new feature as much as
possible before the alpha release.

- read() method returns a list of files parsed successfully
- add tests, documentation
(closes SF patch #677651)

- DuplicateSectionError is only raised by add_section()
(closes SF bug #830449)

- don't allow setting options to non-string values; raise TypeError
  when the value is set, instead of raising an arbitrary exception
  later (such as when string interpolation is performed)
- add tests, documentation
(closes SF bug #810843)

- ensure that option names in interpolations are handled by
  self.optionxform in the same way that other references to option
  names
- add tests, documentation
(closes SF bug #857881, patch #865455)

converting it into assertRaises() form.  Restored the 2.3 code, and
explained why assertRaises() cannot be used instead.