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Process (create, start, join)

Basic Process usage

basic_process.py
from multiprocessing import Process
 
 
def work(name: str) -> None:
    print("Working in process:", name)
 
 
if __name__ == "__main__":
    p = Process(target=work, args=("p1",))
    p.start()
    p.join()
    print("Main process finished")
basic_process.py
from multiprocessing import Process
 
 
def work(name: str) -> None:
    print("Working in process:", name)
 
 
if __name__ == "__main__":
    p = Process(target=work, args=("p1",))
    p.start()
    p.join()
    print("Main process finished")

Why join() matters

join()join() waits for the process to finish.

Without it:

  • your program might exit early
  • you might read results before they are ready

🧪 Try It Yourself

Exercise 1 – Start a Process

Exercise 2 – Process Pool map()

Exercise 3 – Multiprocessing Queue

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