To support "from six.moves.cPickle import loads", we must add a stub for
six.moves.cPickle as if it were a real submodule, even though it isn't
implemented as such. This fixespython/mypy#1550.
We don't apply this approach to six.moves.builtins on Python 2, because
it seems to confuse mypy.
We also add stubs for aliases in six.moves whose underlying modules have
been added to typeshed.
For Python 2:
- six.moves.SimpleHTTPServer (alias for SimpleHTTPServer)
For Python 3:
- six.moves.tkinter_dialog (alias for tkinter.dialog)
- six.moves.tkinter_filedialog (alias for tkinter.filedialog)
- six.moves.tkinter_commondialog (alias for tkinter.commondialog)
- six.moves.tkinter_tkfiledialog (alias for tkinter.filedialog)
* Add missing methods to Python 2 concurrent.futures
Future.exception_info() and Future.set_exception_info() are methods
present only in the Python 2 backport of concurrent.futures.
* Mark timeout args as optional