Check atomic operations on Python

atomic-append.py

import threading
import time
import random

a = []

def add(x):
	for i in range(100):
		print x
		print len(a)
		a.append(x)
	print len(a)

def run(n):
	for x in range(n):
		t = threading.Thread(target = add, args = ([x]))
		# t.daemon = True
		t.start()

run(300)