Traceback (most recent call last):
File "./prog.py", line 9, in <module>
File "/usr/lib/python3.4/inspect.py", line 836, in getsource
lines, lnum = getsourcelines(object)
File "/usr/lib/python3.4/inspect.py", line 825, in getsourcelines
lines, lnum = findsource(object)
File "/usr/lib/python3.4/inspect.py", line 655, in findsource
file = getsourcefile(object)
File "/usr/lib/python3.4/inspect.py", line 571, in getsourcefile
filename = getfile(object)
File "/usr/lib/python3.4/inspect.py", line 536, in getfile
'function, traceback, frame, or code object'.format(object))
TypeError: <super: <class 'B'>, NULL> is not a module, class, method, function, traceback, frame, or code object