import threading
import threading
def fcn1():
print('fcn1 start')
for i in range(5):
print('fcn1 i={}'.format(i))
def fcn2():
print('fcn2 start')
for i in range(5):
print('fcn2 i={}'.format(i))
thread1 = threading.Thread(target=fcn1)
thread2 = threading.Thread(target=fcn2)
thread1.start()
thread2.start()
thread1.join() # join函数决定线程开始的顺序
thread2.join()