How to import and call function(written in python and transferred into go by grumpc) in go? #407

As titled, the newest grumpy.ImportModule function has only 2 params while the comment has not been updated.

And ImportModule(f, "a.b") causes the initialization and entry into sys.modules of Grumpy module a and
then Grumpy module a.b instead of b. Is this a bug?