It says "no Fork/Join frameworks", not "no Fork/Join". You can definitely fork processes in Python: http://docs.python.org/library/os.html#os.fork http://docs.p

It says "no Fork/Join frameworks", not "no Fork/Join". You can definitely fork processes in Python: http://docs.python.org/library/os.html#os.fork http://docs.python.org/library/os.html#os.fork Using different processes allows you to execute code in parallel, but different processes can't access each other's memory, while threads within a process share their memory space and can therefore operate on the same data.