我正在尝试检查字典是否为空,但它的行为不正常。它只是跳过并显示ONLINE除了显示消息之外没有任何其他内容。有什么想法吗?
def isEmpty(self, dictionary):
for element in dictionary:
if element:
return True
return False
def onMessage(self, socket, message):
if self.isEmpty(self.users) == False:
socket.send("Nobody is online, please use REGISTER command" \
" in order to register into the server")
else:
socket.send("ONLINE " + ' ' .join(self.users.keys()))
空字典评估为False在Python中:
>>> dct = {}
>>> bool(dct)
False
>>> not dct
True
>>>
因此,你的isEmpty
功能是不必要的。您需要做的就是:
def onMessage(self, socket, message):
if not self.users:
socket.send("Nobody is online, please use REGISTER command" \
" in order to register into the server")
else:
socket.send("ONLINE " + ' ' .join(self.users.keys()))
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