Store all errors signaling a disconnection into a global frozenset to save some computation time on recv() and send().

independent of the locale. Set LC_ALL=C too.

module.

Closes issue #9848. Thanks to Arfrever Frehtes Taifersar Arahesis for the bug
report.

The forward links are hard references.
The sentinel element is also a weakref proxy
(to break a forward cylce wrapping around the sentinel).

handles non-blocking readinto() returning None correctly.

objects supporting the whole socket API (rather than the "raw"
_socket.socket objects).

Remove pointers to a FAQ entry that no longer exists.  Incorporate some text from the old FAQ into the docs

SSLSocket.sendto() to match the corresponding socket methods.

Issue 9840:  Add reprlib.recursive_repr(), a decorator for handling recursive calls to __repr__ methods.

meet the API of the collections.Sequence ABC.

if the format string is not empty. Manually merge r79596 and r84772
from 2.x.

Also, apparently test_format() from test_builtin never made it into
3.x. I've added it as well. It tests the basic format()
infrastructure.

(macpath module).

when tracing methods.  Unit tests. Patch by Eli Bendersky.

Make test.regrtest.__file__ absolute, this was not always the case when running profile or trace, for example.  (issue #9323)