线程回顾 ----多线程爬虫

import       threading

def run(a):

　　#当前线程

　　c = threading.current_thread()

　　print('子线程开始',c.name)

#创建一个线程

t = threading.Thread( target = run,args=(1,),name='haha')

#启动线程

t.start()

#关闭线程

t.join()

 

 

#基于类的线程

#实例：

import threading
import time

# 写一个类，继承自threading.Thread
# main else
class SingThread(threading.Thread):
def __init__(self, name, a):
super().__init__()
self.name = name
self.a = a

def run(self):
print('线程名字是%s,接受的参数是%s' % (self.name, self.a))
for x in range(1, 6):
print('我在唱七里香')
time.sleep(1)

class DanceThread(threading.Thread):
def __init__(self, name, a):
super().__init__()
self.name = name
self.a = a

def run(self):
print('线程名字是%s,接受的参数是%s' % (self.name, self.a))
for x in range(1, 6):
print('我在跳广场舞')
time.sleep(1)

def main():
# 创建线程
tsing = SingThread('sing', '猪八戒')
tdance = DanceThread('dance', '猪悟能')

# 启动线程
tsing.start()
tdance.start()

# 让主线程等待结束
tsing.join()
tdance.join()

print('主线程和子线程全部结束')

if __name__ == '__main__':
main()