Threading_Tutorial_03.py

import threading

i = 0
THREAD_CNT = 10
LOOP_CNT = 50000

def foo():
    """This will increment the global variable i in a thread unsafe way"""
    global i
    for _ in range(LOOP_CNT):
        i += 1  # increments the global variable

threads = [threading.Thread(target=foo) for _ in range(THREAD_CNT)]
for t in threads:
    t.start()  # starts each thread

for t in threads:
    t.join()  # waits for each thread to complete execution

print("Expected: ".ljust(10), len(threads) * LOOP_CNT)
print("Actual: ".ljust(10), i)