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this video might help: https://youtu.be/PzlQPNNt8T4?t=147
(video starts at 2:27)
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>>> import os
>>> import sys
>>> os.path.dirname(sys.executable)
'C:\\Python25'
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import imp
print("Location of Python os module sources:")
print(imp.find_module('os'))
print("\nLocation of Python time module sources:")
print(imp.find_module('time'))