The im_class/func/self names were removed in 3.0. The prefix appears nowhere else in inspect.py
and nowhere in inspect.rst.
"""Get useful information from live Python objects.
This module encapsulates the interface provided by the internal special
-attributes (co_*, im_*, tb_*, etc.) in a friendlier fashion.
+attributes (co_*, tb_*, etc.) in a friendlier fashion.
It also provides some help for examining source code and class layout.
Here are some of the useful functions provided by this module: