Add length checking to single-file mailbox formats: before doing a
flush() on a mailbox, seek to the end and verify its length is
unchanged, raising ExternalClashError if the file's length has
changed.

This fix avoids potential data loss if some other process appends to
the mailbox file after the table of contents has been generated;
instead of overwriting the modified file, you'll get the exception.

I also noticed that the self._lookup() call in self.flush() wasn't
necessary (everything that sets self._pending to True also calls
self.lookup()), and replaced it by an assertion.

2.5 backport candidate.

Needs to be backported.

if a buffer given to frombuf() is invalid.

Updated documentation for findCaller() to indicate that a 3-tuple is now returned, rather than a 2-tuple.

try...finally to ensure the lock is always released.  This could use
the 'with' statement, but the patch uses 'finally'.

2.5 backport candidate.

Also, the text for recvfrom told you to read recv() for an explanation of the
'flags' argument, but recv() just pointed you at the man page.  Copied the
man-page text to recvfrom(), recvfrom_into, recv_into to avoid the pointless
redirection.

I don't have LaTeX on this machine; hope my markup is OK.

   instead of a more general XOR that has to construct a list.

Slightly modified from Maurer's patch: the _strxor() function is no longer
necessary at all.

simple slices.

[Bug #1616726] Fix description of generator.close(); if you raise some random exception, the exception is raised and doesn't trigger a RuntimeError

2. Duplicate some old entries from Python's NEWS to IDLE's NEWS.txt

M    AutoCompleteWindow.py
M    NEWS.txt

manager that protects warnings.filter from being modified once the context is
exited.

to be created is already there.

English output.

Port Georg's dictobject.c fix keys that were tuples got unpacked on the way to setting a KeyError (svn revision 52535, sf bug
1576657).

remove reference to the old regex module in the former's doc.

will have a '_files' attribute.