python进程与线程小结实例分析

# -*- coding:utf-8 -*-
import threading
import time
def run(n):
  print('task',n)
  time.sleep(3)
if __name__ == '__main__':
  run('t1')
  run('t2')

# -*- coding:utf-8 -*-
import threading
import time
def run(n):
  print('task',n)
  time.sleep(3)

if __name__ == '__main__':
  t1=threading.Thread(target=run,args=('t1',))
  t2=threading.Thread(target=run,args=('t2',))
  t1.start()
  t2.start()

# -*- coding:utf-8 -*-
import threading
import time
class MyThread(threading.Thread):
  def __init__(self,n):
    super(MyThread,self).__init__()
    self.n=n
  #这里面默认就有一个run方法
  def run(self):
    print('runing task',self.n)
if __name__ == '__main__':
  #在主方法通过对象调用线程
  t1=MyThread('t1')
  t2=MyThread('t2')
  t1.run()
  t2.run()

# -*- coding:utf-8 -*-
import threading
import time
def run(n):
  print('task',n)
  time.sleep(3)
if __name__ == '__main__':
  for i in range(10):
    t=threading.Thread(target=run,args=('t-%s'%i,))
    t.start()

# -*- coding:utf-8 -*-
import threading
import time
def run(n):
  print('task',n)
  time.sleep(3)
if __name__ == '__main__':
  time_start=time.time()
  #定义一个空列表装线程t实例
  t_objects=[]
  for i in range(10):
    t=threading.Thread(target=run,args=('t-%s'%i,))
    t.start()
    t_objects.append(t)
  # 等所有线程执行完后，再执行下面的代码
  # 因为线程与下面的代码是同时运行的
  # 要想先等线程执行完毕再执行其它代码
  # 使用join()方法进行阻塞
  #在这里统一结束所有t线程
  for i in t_objects:
    t.join()
  time_end=time.time()
  sun=time_end-time_start
  print(sun)