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).

the subprocess module on Linux.

Fix issue16932: Fix the urlparse example. Remote :port when scheme is not specified to demonstrate correct behavior

Fix issue16932: Fix the urlparse example. Remote :port when scheme is not specified to demonstrate correct behavior

invalid characters (outside range [U+0000; U+10ffff]) to Unicode: repr(array),
str(array) and array.tounicode(). Patch written by Manuel Jacob.

the range U+0000-U+10ffff.