keyword-only argument.  The preceding positional argument was deprecated,
so it made no sense to add filter as a positional argument.

(Patch reviewed by Brian Curtin and Anthony Long.)

Parser => BytesParser

(Reviewed by Georg Brandl.)

Also made similar changes to deque.reverse() though this wasn't
strictly necessary (the edge case cannot occur with two pointers
moving to meet in the middle).  Making the change in reverse()
was more a matter of future-proofing.

run with tracing turned on.

        with non-ASCII characters in their path names.

        (with approval of release manager for 3.2rc2)

Issue #9509: make argarse properly handle IOErrors raised by argparse.FileType. Approved by Georg in the tracker.

Original patch by Michal Nowikowski, with some additions and wording
fixes by me.

I changed the wording from 'Performs a stat system call' to 'Performs
the equivalent of a stat system call', since on Windows there are no
stat/lstat system calls involved.  I also extended Michal's breakout
of the attributes into a list to the other paragraphs, and rearranged
the order of the paragraphs in the 'stat' docs to make it flow
better and put it in what I think is a more logical/useful order.

function set. Otherwise a Python fatal error about hitting an unrecoverable
recursion depth gets triggered.

Closes issue #10985. Code review by Georg Brandl.