The pure Python fallback implementation of functools.partial
now matches the behaviour of its accelerated C counterpart for
subclassing, pickling and text representation purposes.

Patch by Emanuel Barry and Serhiy Storchaka.

Patch by Ethan Furman.

Patch by Ethan Furman.

patches by Matt Joiner and Alexey Kachayev.

with specified exception type.  Original patch by Ramchandra Apte.

(Sugguested by Serhiy Storchaka)

implementation in issue #21408 they are redundant.

methods created by functool.total_ordering.

fully qualified class names of Python implemented classes.

Initial patch by Alon Horev

(Patch by Katie Miller)

ModuleNotFoundError.

PEP accepted: http://mail.python.org/pipermail/python-dev/2013-June/126734.html

Keep references for oldkey and oldvalue so they can't
trigger a __del__ method to reenter our thread.

Move the cache[key]=link step to the end, after the link
data is in a consistent state.

Under exotic circumstances, the cache[key]=link step could
trigger reentrancy (i.e. the key would have to have a hash
exactly equal to that for another key in the cache and the
key would need a __eq__ method that makes a reentrant call
our cached function).

Patch by Brian Thorne.