Multiprocessing why executes the main code?

Question

Python

print("начало")

def aa():
    time.sleep(1)
    print("Конец кода")


if __name__ == '__main__':
    p = Process(target=aa)
    p2 = Process(target=aa)
    p3 = Process(target=aa)
    p.start()
    p2.start()
    p3.start()

In this example, when starting multiprocessing, in addition to the function that is taken in the target, it executes the main code, why ?
The output of this code will be:

начало
начало
начало
начало
Конец кода
Конец кода
Конец кода

this happens to everything, if there are mouse clicks it clicks every time you start multiprocessing , how to fix it ?

Answer 1

Because each new process is a separate Python interpreter that re-imports the script, and when importing, all top-level instructions are executed.