default: closes Issue12365 - Add an example explaining the context manager use case of urllib.urlopen

Issue10050 - urlretrieve uses newer urlopen. reporthook of urlretrieve takes, block number, block read size, file_size

structure. timeval.tv_sec is a long on Windows, not time_t.

gmtime() failure on Windows

and datetime.datetime.utcfromtimestamp() now raise an OSError instead of
ValueError if localtime() or gmtime() failed.

Patch by Roger Serwy.

Patch by Roger Serwy.

Patch by Guilherme Polo and Andrew Svetlov.

Patch by Guilherme Polo and Andrew Svetlov.

Mac OS X to prevent interpreter crashes when compiled on 10.7.

Use volatile keyword to disable localy unsafe float optimizations.

time.ctime(), gmtime(), time.localtime(), datetime.date.fromtimestamp(),
datetime.datetime.fromtimestamp() and datetime.datetime.utcfromtimestamp() now
raises an OverflowError, instead of a ValueError, if the timestamp does not fit
in time_t.

datetime.datetime.fromtimestamp() and datetime.datetime.utcfromtimestamp() now
round microseconds towards zero instead of rounding to nearest with ties going
away from zero.