if the same class name is used within a module, but defined in different contexts (either class in class or class in function), inspect.getsourcelines() on the class object ignores the object context and only returns the first matched name.

reproduce:

a.py
----
class A(object):
    class B(object):
        pass

class C(object):
    class B(object):
        pass

------------------
>>> import inspect
>>> import a
>>> inspect.getsourcelines(a.C.B)
(['    class B(object):\n', '        pass\n'], 2)