reload

For Python 2 use built-in function reload():

reload(module)

For Python 2 and 3.2–3.3 use reload from module imp:

imp.reload(module)

But imp is deprecated since version 3.4 in favor of importlib, so use:

importlib.reload(module)

출처 : http://stackoverflow.com/questions/437589/how-do-i-unload-reload-a-python-module