的Python：UnboundLocalError：分配

Question

之前引用局部变量我有一段代码，这里在Python线程（服务器），但是当我运行客户端发现这些错误：“UnboundLocalError：局部变量‘一站式’分配之前引用” ：

import threading 
import msvcrt 

stop = False 
Buffer= 1024 

class ChatServer(threading.Thread): 
    def __init__(self,channel,addr,counter): 
     self.channel = channel 
     self.addr = addr 
     self.counter = counter 
     threading.Thread.__init__(self) 
     self.start() 

    def run(self): 
     # press s to trigger 
     if msvcrt.kbhit(): 
      if msvcrt.getch() == 's': 
       stop = True 
       print "Login is closed closed.\n" 
     while 1: 
      if (stop == False): 
       print "\nClient connection received!\n" 
       self.channel.send("Status: Server connection received") 

counter = 0     
server = socket.socket(socket.AF_INET,socket.SOCK_STREAM) 
server.bind(("",500)) 
server.listen(20) 

while True: 
    print "\nServer awaiting connections....\n" 
    channel, addr = server.accept() 
    counter += 1 
    ChatServer(channel,addr,counter) 

Answer 1

你只设置变量stop非常特殊的情况下，从来没有把它设置为False。将一个明确的stop = False添加到run()函数的顶部。

def run(self): 
    stop = False 
    # press s to trigger 
    if msvcrt.kbhit(): 
     if msvcrt.getch() == 's': 
      stop = True 
      print "Login is closed closed.\n" 
    while 1: 
     if (stop == False): 
      print "\nClient connection received!\n" 
      self.channel.send("Status: Server connection received") 

你可能希望在某个时候设置stop内的while循环，因为它代表如果达到stop = True它永远不会停止。