Python：UnboundLocalError：赋值前引用的局部变量

Python: UnboundLocalError: local variable referenced before assignment

我在python线程(服务器)中有一段代码，但是当我运行客户机时，发现了这些错误："unboundlocalerror:local variable'stop'referenced before assignment"：

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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.
"
while 1:
if (stop == False):
print"
Client connection received!
"
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"
Server awaiting connections....
"
channel, addr = server.accept()
counter += 1
ChatServer(channel,addr,counter)