It's possible for PyErr_NormalizeException() to set the traceback
pointer to NULL.  I'm not sure how to provoke this directly from
Python, although it may be possible.  The error occurs when an
exception is set using PyErr_SetObject() and another exception occurs
while PyErr_NormalizeException() is creating the exception instance.

XXX As a result of this change, it's possible for an exception to
occur but sys.last_traceback to be left undefined.  Not sure if this
is a problem.

In both the HTML and typeset versions of the documentation, add a colon
after the name of a mail header so that it is more easily distinguished
from other text.

when using the \mailheader markup.
Change a couple of inline examples to show the markup rather than the
result.

Clarify the \mimetype description; it can be used to refer to a part of a
MIME type name, so \mimetype{text} or \mimetype{plain} can be used, not
just \mimetype{text/plain}.

this before we finish the integration, along with some restructuring.

a better place. Excessively fragile code, but at least it breaks when
something in this area changes!

added some new tests of message/delivery-status content type messages.

    Also, add a clause to the big-if to handle message/delivery-status
    content types.  These create a message with subparts that are
    Message instances, which best represent the header blocks of this
    content type.

get_type(): Use a compiled regular expression, which can be shared.

_get_params_preserve(): A helper method which extracts the header's
    parameter list preserving value quoting.  I'm not sure that this
    needs to be a public method.  It's necessary because we want
    get_param() and friends to return the unquoted parameter value,
    however we want the quote-preserved form for set_boundary().

get_params(), get_param(), set_boundary(): Implement in terms of
    _get_params_preserve().

walk(): Yield ourself first, then recurse over our subparts (if any).

    subtype for consistency with the rest of the package.

typed_subpart_iterator(): Arguments major renamed to maintype and
    minor renamed to subtype for consistency with the rest of the
    package.

Text.py and class Text => MIMEText.py and MIMEText

MessageRFC822.py and class MessageRFC822 => MIMEMessage.py and MIMEMessage

These are renamed so as to be more consistent; these are MIME specific
derived classes for when creating the object model out of whole cloth.

    _handle_text(): If the payload is None, then just return (i.e. don't
	write anything).  Subparts of message/delivery-status types
	will have this property since they are just blocks of headers.

	Also, when raising the TypeError, include the type of the
	payload in the error message.

    _handle_multipart(), _handle_message(): When creating a clone of self,
	pass in our _mangle_from_ and maxheaderlen flags so the clone
	has the same behavior.

    _handle_message_delivery_status(): New method to do the proper
	printing of message/delivery-status type messages.  These have
	to be handled differently than other message/* types because
	their payloads are subparts containing just blocks of headers.

In class DecodedGenerator:

    _dispatch(): Skip over multipart/* messages since we don't care
        about them, and don't want the non-text format to appear in
        the printed results.

Fred prefers.  I'm not sure I like this organization, so it may change.

Rather than add umpteen new obscure internal Iter types, got rid of all of
them.  See the new comment.

iterator, just test to make sure it has the two required iterator
protocol methods __iter__() and next() -- actually just test
hasattr-ness.

their 'i' and 'r' variants) were not being generated if the
corresponding nb_ slots were present in the type object.  I bet this
is because floor and true division were introduced after I last
looked at that part of the code.

use it.  This simplifies the individual tests a little.

Added some new tests related to exception handling.

the local save/modify/restore of sys.stdout, but add machinery so that
regrtest can tell test_support the value of sys.stdout at the time
regrtest.main() started, and test_support can pass that out later to anyone
who needs a "visible" stdout.

__class__.  The __new__ protocol is up to this.  (Thanks to Tim for
pointing this out.)

favor of local save/modify/restore.  The test suite should run fine again.

This closes SF bug #448918.

the object has been pickled; don't mutate the instance dict in the
__getstate__() method.  Other minor changes for style.  Broke up the
displayed interactive session to get better page-breaking behavior for
typeset versions, and to point out an important aspect of the example.

This closes SF bug #453914.

- Made cls.__module__ writable.

- Ensure that obj.__dict__ is returned as {}, not None, even upon first
  reference; it simply springs into life when you ask for it.

(*) The pickling support is provisional for the following reasons:

- It doesn't support classes with __slots__.

- It relies on additional support in copy_reg.py: the C method
  __reduce__, defined in the object class, really calls calling
  copy_reg._reduce(obj).  Eventually the Python code in copy_reg.py
  needs to be migrated to C, but I'd like to experiment with the
  Python implementation first.  The _reduce() code also relies on an
  additional helper function, _reconstructor(), defined in
  copy_reg.py; this should also be reimplemented in C.

standalone.

This closes SF patch #461337.

Cleaned up a bunch of XXX comments containing links to additional
information, replacing them with proper references.
Replaced "MacOS" with "Mac OS", since that's what the style guide says.

Also did some whitespace normalization.

  property() (get, set, del; not set, get, del).

+ Change "Data defined/inherited in ..." header lines to
  "Data and non-method functions defined/inherited in ...".  Things like
  the value of __class__, and __new__, and class vrbls like the i in
      class C:
          i = int
  show up in this section too.  I don't think it's worth a separate
  section to distinguish them from non-callable attrs, and there's no
  obvious reliable way to distinguish callable from non-callable attrs
  anyway.

Add news items about comparisons, repr(), __class__ assignment.

than <type 'ClassName'>.  Exception: if it's a built-in type or an
extension type, continue to call it <type 'ClassName>.  Call me a
wimp, but I don't want to break more user code than necessary.

same.  I hope the test for structural equivalence is stringent enough.
It only allows the assignment if the old and new types:

- have the same basic size
- have the same item size
- have the same dict offset
- have the same weaklist offset
- have the same GC flag bit
- have a common base that is the same except for maybe the dict and
  weaklist (which may have been added separately at the same offsets
  in both types)