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import threading

def job1():

global A, lock

lock.acquire()

for i in range(10):

A += 1

print('job1', A)

lock.release()

def job2():

global A, lock

lock.acquire()

for i in range(10):

A += 10

print('job2', A)

lock.release()

if __name__ == '__main__':

lock = threading.Lock()

A = 0

t1 = threading.Thread(target=job1)

t2 = threading.Thread(target=job2)

t1.start()

t2.start()

t1.join()

t2.join()