existent path.  Pointed out by jvr that entries could be non-file items for
custom importers.

for regex syntax.
Fixes bug #883604 .

isinstance() or issubclass() to the recursion limit of the interpreter.

Change %08l to %p to print a pointer.
Will backport to 2.3.

'a.extend(a)' isn't so special anyway.

I've been bitten by this myself in the past half year.
I hope this fix is right.
I'll backport this to 2.3.

UNTESTED!!!

This simple two-line patch has been sitting on SF for more than 2 years.
I'm guessing it's because nobody knows how to test it -- I sure don't.
It doesn't look like you can get to this part of the code on Unixish
or Windows systems, so the "how to test it?" puzzle has more than one
part.  OTOH, if this is dead code, it doesn't matter either if I just
broke it <wink>.

all whitespace at the end of the path line.

Removed Win9x notes (since the .NET compiler requires Win2K or XP anyway).

parser -- for now. Failure behaviour of the new parser(s) will change in any
case, so this will be revisited later anyway.

HMAC.__init__().  Adapted from SF patch 895445 "hmac.HMAC.copy() speedup"
by Trevor Perrin, who reported that this approach increased throughput
of his hmac-intensive app by 30%.

new pattern for NEXTARG() is detected and optimized as a single (*short)
loading.

necessarily always set before used.  Between Tim, Armin & me we
couldn't prove GCC wrong, so we decided to fix the algorithm.  This
version is Armin's.

Replace 1 and 0 with True and False.

> ----------------------------
> revision 1.20.4.4
> date: 2003/06/12 09:14:17;  author: anthonybaxter;  state: Exp;  lines: +13 -6
> preamble is None when missing, not ''.
> Handle a couple of bogus formatted messages - now parses my main testsuite.
> Handle message/external-body.
> ----------------------------
> revision 1.20.4.3
> date: 2003/06/12 07:16:40;  author: anthonybaxter;  state: Exp;  lines: +6 -4
> epilogue-processing is now the same as the old parser - the newline at the
> end of the line with the --endboundary-- is included as part of the epilogue.
> Note that any whitespace after the boundary is _not_ part of the epilogue.
> ----------------------------
> revision 1.20.4.2
> date: 2003/06/12 06:39:09;  author: anthonybaxter;  state: Exp;  lines: +6 -4
> message/delivery-status fixed.
> HeaderParser fixed.
> ----------------------------
> revision 1.20.4.1
> date: 2003/06/12 06:08:56;  author: anthonybaxter;  state: Exp;  lines: +163 -129
> A work-in-progress snapshot of the new parser. A couple of known problems:
>
> - first (blank) line of MIME epilogues is being consumed
> - message/delivery-status isn't quite right
>
> It still needs a lot of cleanup, but right now it parses a whole lot of
> badness that the old parser failed on. I also need to think about adding
> back the old 'strict' flag in some way.
> =============================================================================

as license.tex (SF patch 795531 complained about the spelling discrepancy,
although this "repairs" that flaw in a different way than the patch).

standard library:
str() of xml.sax.SAXParseException should not fail if the line and/or
column number returned by the locator are None
(tests added)

                       Py_USING_UNICODE is defined

* The default __reversed__ performed badly, so reintroduced a custom
  reverse iterator.
* Added length transparency to improve speed with map(), list(), etc.

This gives another 30% speedup for operations such as
map(func, d.iteritems()) or list(d.iteritems()) which can both take
advantage of length information when provided.

directory.

* Split into three separate types that share everything except the
  code for iternext.  Saves run time decision making and allows
  each iternext function to be specialized.

* Inlined PyDict_Next().  In addition to saving a function call, this
  allows a redundant test to be eliminated and further specialization
  of the code for the unique needs of each iterator type.

* Created a reusable result tuple for iteritems().  Saves the malloc
  time for tuples when the previous result was not kept by client code
  (this is the typical use case for iteritems).  If the client code
  does keep the reference, then a new tuple is created.

Results in a 20% to 30% speedup depending on the size and sparsity
of the dictionary.

* Factored constant structure references out of the inner loops for
  PyDict_Next(), dict_keys(), dict_values(), and dict_items().
  Gave measurable speedups to each (the improvement varies depending
  on the sparseness of the dictionary being measured).

* Added a freelist scheme styled after that for tuples.  Saves around
  80% of the calls to malloc and free.  About 10% of the time, the
  previous dictionary was completely empty; in those cases, the
  dictionary initialization with memset() can be skipped.