instead of silently return incorrect result.

Based on patch by SilentGhost.

The reload(sys) effect was the crux of a Stackoverflow question.

* Fix acquire() signature
* Remove outdated help(LockType) reference
* Replace PyThread_allocate_lock() with threading.Lock()

Patch by Christopher Welborn.

Patch by Marco Buttu.

Patch by Ofer Schwarz.

The bug only occurs on SunOS when the ctypes implementation searches
for the `crle` program.  Patch by Xiang Zhang.  Tested on SunOS by
Kees Bos.

Patch by Xiang Zhang.

test_reset_internal_locks was looking at Event's _cond._lock. This
makes it harder to change internals of the Condition object and
makes the test fragile.

The test was added by Nir Soffer in 6108d30dde21.

Patch by Nir Soffer.

itemgetter, attrgetter and methodcaller objects.

Patch by Xiang Zhang.

Patch by Xiang Zhang.

over UPPER_CASE or Mixed_Case ones.

Patch contributed by Hans-Peter Jansen. Reviewed by Martin Panter and Senthil Kumaran.

Reported by Saul Spatz on docs@

differing items (like bytes in the -b mode).  This affects assertListEqual()
and assertTupleEqual().

There were duplicated methods with the same name and body.

reopened on Windows.  Added tests for fallbacks.

We will keep platform.dist() and platform.linux_distribution() to make porting
from Python 2 easier.

Patch by Kumaripaba Miyurusara Athukorala.

See https://mail.python.org/pipermail/python-legal-sig/2013-November/000059.html
for details.

Patch by Antoine Pitrou.

Patch by Corey Brune.

All signal.SIG* constants may not be defined on Windows so a call like

    signal.signal(signal.SIGPIPE, lambda signum, frame: sys.exit(1))

will raise an AttributeError.

* Explain how 'error_message_format' is used by 'send_error' method
* Mention that 'responses' is used by 'send_response_only' and 'send_error' methods
* Replace 'class variables' with 'attributes'

Initial patch by Anastasia Filatova.

silently ignore keyword arguments.