Broken auto completion in some cases

[sebastinas]

This is a follow up to #726. In this specific case, the signature of Qt.QtWidget.setfocusPolicy as recognized by bpython is Qt.QtWidget.setFocusPolicy(self, Qt.FocusPolicy) where Qt.FocusPolicy denotes a type. So on Qt.<Tab> bpython expected the user to auto complete the argument Qt.FocusPolicy and offers Qt.FocusPolicy=. This is wrong.

[sebastinas]

This essentially affects builtin functions where the documentation is used to get function signature. In a similar way, the auto completion for print is also somewhat broken since it has a signature of (value, ..., sep=' ', end='\n', fle=sys.stdout, flush=False).