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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)