[ Python 常見問題 ] How do I get the filepath for a class in Python?

Source From Here
Question
Given a class C in Python, how can I determine which file the class was defined in? I need something that can work from either the class C, or from an instance off C.

How-To
You can use the inspect module, like this:
- A.py

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1. class A(object):  
2.     def __init__(self):  
3.         print "Class A constructor"  

- B.py

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1. class B(object):  
2.     def __init__(self):  
3.         print "Class B constructor"  

Then enter Python Interactive Mode:

>>> from A import *
>>> a = A()
Class A constructor
>>> from B import *
>>> b = B()
Class B constructor
>>> import inspect
>>> inspect.getfile(a.__class__)
'A.py'
>>> inspect.getfile(b.__class__)
'B.py'
>>> inspect.getfile(A)
'A.py'
>>> inspect.getfile(B)
'B.py'