Advanced Python Programming

Introductory example in Python

To illustrate the concept of running multiple processes on one operating system, let's look at a quick example in Python. Let's take a look at the Chapter13/example1.py file, as shown in the following code:

# Chapter13/example1.pyfrom multiprocessing import Processimport timedef count_down(name, delay):    print('Process %s starting...' % name)    counter = 5    while counter:        time.sleep(delay)        print('Process %s counting down: %i...' % (name, counter))        counter -= 1    print('Process %s exiting...' % name)if __name__ == '__main__':    process1 = Process(target=count_down, args=('A', 0.5))    process2 = Process(target=count_down, args=('B', 0.5))    process1.start()    process2.start()    process1.join()    process2.join()    print('Done.')