Python threading

threads.py

from random import randint
from threading import Thread
from time import sleep


class DoSomething(Thread):
    def run(self):
        for i in range(1, 10):
            print(i)
            sleep(1)

class DoSomethingElse(Thread):
    def run(self):
        for i in range(1, 10):
            print("bla")
            sleep(randint(0, 2))

a = DoSomething()
b = DoSomethingElse()

a.start()
b.start()

a.join()
b.join()