[Python] I'm trying to get two functions to run at the same time

I'm trying to get my script to run two functions at the same time. But what happens is function2 will not start until function1 finishes.

import multiprocessing
process1 = multiprocessing.Process(target=function1())
process1.start()
process2 = multiprocessing.Process(target=function2())
process2.start()
process3 = multiprocessing.Process(target=function3())
process3.start()

process1.join()
process2.join()
process3.join()

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