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In an application with an entry point of __main__.py, multiprocessing.Pool throws the following:
Traceback (most recent call last):
 File "<string>", line 1, in <module>
 File "D:\Dev\Python27\lib\multiprocessing\forking.py", line 346, in main
 prepare(preparation_data)
 File "D:\Dev\Python27\lib\multiprocessing\forking.py", line 454, in prepare
 assert main_name not in sys.modules, main_name
AssertionError: __main__
These messages repeat as long as the application is running.
Demonstration Code, must be in file named __main__.py:
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import multiprocessing
import time
if __name__ == '__main__':
 pool = multiprocessing.Pool()
 time.sleep(2)
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