itertools, operator and functools are not really "numeric" modules; move them into their own "functional" chapter.

Björn Lindqvist.

And not the compilation (if the input is a string).

That's why I prefer a single instruction per line :-)

Fix a ResourceWarning(unclosed socket). Patch written by Nadeem Vawda.

Fix a ResourceWarning(unclosed socket) if an exception is raised in the
constructor after the creation of the socket. Patch written by Nadeem Vawda.

- removed unnecessary struct_time to tuple conversion
- added more unit tests
(See issue #10827 for discussion.)

socket is now always non-blocking, regardless of the operating system.

Patch by Jean-Paul Calderone and Sandro Tosi.

Popen.communicate() avoids deadlocks and close the pipes when done. This commit
fixes a ResourceWarning(unclosed pipe).

Fix a ResourceWarning(unclosed file).

PyUnicode_FromFormat() and PyErr_Format() allocates a buffer of the needed
size, it is no more a fixed-buffer of 500 bytes.

There's still a bug here (the encode call shouldn't use the 'errors'
paramter), but I'll fix that later.

Instead of _testcapi.format_unicode() because it has a limited API: it requires
exactly one argument of type unicode.