idx variable is used for a tuple indexn so use Py_ssize_t (not int).

is long, not int.

ftplib tests: provide a global socket's TIMEOUT variable and use it everywhere so that failing tests won't accidentally hang

to the new section.

(Issue #17807: Generators can now be finalized even when they are part of a reference cycle)

  in urllib.request.urlopen() is fixed to match the code.

  in urllib.request.urlopen() is fixed to match the code.