python-Day8

 1 while True:
 2     num1 = input(‘num1:‘)
 3     num2 = input(‘num2:‘)
 4     try:
 5         num1 = int(num1)
 6         num2 = int(num2)
 7         result = num1 + num2
 8     except ValueError as e:
 9         print(‘value err‘,e)
10     except Exception as e:
11         print(‘Error info:‘)
12         print(e)

 1 class JefException(Exception):
 2     def __init__(self,msg):
 3         self.message = msg
 4 
 5     def __str__(self):
 6         return self.message
 7 
 8 a = 1
 9 try:
10     assert a == 1
11     #raise JefException(‘My Error‘)
12 except JefException as e:
13     print(e)
14 else:
15     print(‘hahaha else‘)
16 finally:
17     print(‘no matter right or wrong,run this anywhere‘)

 1 import threading,time
 2 
 3 def run(n):
 4     semaphore.acquire()
 5     time.sleep(1)
 6     print("run the thread: %s\n" %n)
 7     semaphore.release()
 8 
 9 if __name__ == ‘__main__‘:
10 
11     num= 0
12     semaphore  = threading.BoundedSemaphore(5) #最多允许5个线程同时运行
13     for i in range(20):
14         t = threading.Thread(target=run,args=(i,))
15         t.start()
16 
17 while threading.active_count() != 1:
18     pass #print threading.active_count()
19 else:
20     print(‘----all threads done---‘)
21     print(num)

 1 import threading
 2 import time
 3 
 4 def sayhi(num): #定义每个线程要运行的函数
 5 
 6     print("running on number:%s" %num)
 7 
 8     time.sleep(3)
 9 
10 if __name__ == ‘__main__‘:
11     ‘‘‘t1 = threading.Thread(target=sayhi,args=(1,)) #生成一个线程实例
12     t2 = threading.Thread(target=sayhi,args=(2,)) #生成另一个线程实例
13 
14     t1.start() #启动线程
15     t2.start() #启动另一个线程
16 
17     print(t1.getName()) #获取线程名
18     print(t2.getName())
19     t2.join()#t2.wait
20 ‘‘‘
21     t_list = []
22     for i in range(10):
23         t = threading.Thread(target=sayhi,args=[i,])
24         t.start()
25     for i in t_list:
26         i.join()
27     print(‘----main----‘)

 1 class MyThread(threading.Thread):
 2     def __init__(self,num):
 3         threading.Thread.__init__(self)
 4         self.num = num
 5 
 6     def run(self):#定义每个线程要运行的函数
 7 
 8         print("running on number:%s" %self.num)
 9 
10         time.sleep(3)
11 
12 if __name__ == ‘__main__‘:
13 
14     t1 = MyThread(1)
15     t2 = MyThread(2)
16     t1.start()
17     t2.start()

 1 import time
 2 import threading
 3 
 4 def run(n):
 5 
 6     print(‘[%s]------running----\n‘ % n)
 7     time.sleep(2)
 8     print(‘--done--‘)
 9 
10 def main():
11     for i in range(5):
12         t = threading.Thread(target=run,args=[i,])
13         #time.sleep(1)
14         t.start()
15         #t.join(1)
16         print(‘starting thread‘, t.getName())
17 
18 
19 m = threading.Thread(target=main,args=[])
20 m.setDaemon(True) #将主线程设置为Daemon线程,它退出时,其它子线程会同时退出,不管是否执行完任务
21 m.start()
22 m.join(timeout=3)
23 print("---main thread done----")