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import threading

import time

# def p(x):

# time.sleep(1)

# print(x)

#

# for i in range(10):

# p(i)

#

# for i in range(10):

# t = threading.Thread(target=p, args=(i,))

# t.start()

def a():

print('start a')

time.sleep(3)

b()

def b():

print('start b')

t1 = threading.Thread(target=a)

# t1.setDaemon(True) # 为True时主线程不等子线程退出再退出,默认FALSE

t1.start()

t1.setName('NB')

print(t1.getName())

t1.join() # 等子线程结束再往下执行,不再并发执行

t2 = threading.Thread(target=a)

# t2.setDaemon(True)

t2.start()

print(t2.is_alive())

t2.join(2) # 最多等2秒

t3 = threading.Thread(target=a)

# t3.setDaemon(True)

t3.start()

print(t3.isDaemon())

print(t3.ident)