Please describe the problem:
Several methods of the form do_* of gtk.Widget (they are "virtual", if I understood correctly) give misleading errors if called with wrong parameters.


Steps to reproduce:
>>> import gtk
>>> gtk.Label().do_size_request()
Traceback (most recent call last):

+ Trace 211491

Actual results:
I get an error which error message is wrong:
1) because size_request takes only 1 argument, the instance
2) because size_request is not the function I called
3) because I did give an argument

I'm not sure of what exactly is happening (is it a single bug or two combined?) because unfortunately I wasn't able to find documentation about those methods.

Expected results:
I'd expect (if I correctly guess documentation):

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: GtkWidget.do_size_request() takes exactly 2 arguments (1 given)

Does this happen every time?
yes

Other information:
It's not peculiar to this method: also see do_expose_event, do_set_name... lots of do_*, I'd guess (but for instance not gtk.CellRendererText().do_get_size(), which prints:

TypeError: GtkCellRenderer.do_get_size() takes at least 2 arguments (0 given)

, and while I still don't get "(0 given)" part, the first is correct).