Function using___main__

Lib/test/test_crossinterp.py:349–357

Make sure __main__ module exists (and clean up after).

()

@contextlib.contextmanager
def using___main__():
    """Make sure __main__ module exists (and clean up after)."""
    modname = '__main__'
    if modname not in sys.modules:
        with import_helper.isolated_modules():
            yield import_helper.add_module(modname)
    else:
        with import_helper.module_restored(modname) as mod:
            yield mod


@contextlib.contextmanager