线程的join方法

线程的join方法

方法一：

from threading import Thread
import time
def task():
  print('子线程 start')
  time.sleep(2)
  print('子线程 end')
  
  
t = Thread(target=task)
t.start()
t,join()# 等待子线程运行结束
print('主线程')

方法二：

from threading import Thread
import time
def task(name,n):
  print(f'{name} start')
  time.sleep(2)
  print(f'{name} end')
  
  
t1 = Thread(target = task,args=('线程1'，1))
t2 = Thread(target = task,args = ('线程2',2))
t3 = Thread(target = task,args=('线程3'.3))
start = time.time()
t1.start()
t2.start()
t3.start()
t1.join()
t2.join()
t3.join()
end = time.time()

了解进程的join

from multiprocessing import Process
from threading import Thread
import time
def task():
  print('进程 开启')
  time.sleep(10)
  print('进程 结束')
  
def task2():
  print('子线程 开启')
  time.sleep(2)
  print('子线程 结束')
  
  
if __name__ == '__main__':
  p = Process(target=task)
  t = Thread(target = task2)
  t.start()
  p.start()
  print('子进程join开始')
  p.join
  print('主')