UnboundLocalError：分配前已引用本地變量“用戶”

Question

這是在我使用的聊天室中運行主持人機器人的代碼的一部分。 代碼的這一部分是批准某人的請求，但是每當我使用該命令時，我都會收到此未綁定的本地錯誤...我已經經歷了很多次，而且我不知道為什么要得到它。

def approveCam(room, identifier):
    if not room.bpass:
        return

    if type(identifier) in [str, unicode, int]:
        user = room._getUser(identifier)
        if not user:
            return "User " + str(identifier) + " was not found..."

    if user.broadcasting:
        return

    room._sendCommand("privmsg", [room._encodeMessage("/allowbroadcast " + room.bpass),
    "#0,en" + "n" + str(user.id) + "-" + user.nick])

問題似乎出在“ if user.broadcasting：”

該代碼可在這樣的舊版漫游器上正常工作

def approveCam(room, user):
    if type(user) is str or type(user) is unicode:
        nick = user
        user = room._getUser(user)
    if not user:
        return "User "+nick+" was not found..."

    if not room.bpass:
        return

    room._sendCommand("privmsg", [room._encodeMessage("/allowbroadcast "+room.bpass),
    "#0,en"+"n"+ user.id+"-"+user.nick])

這是我嘗試運行命令時在命令提示符下得到的響應。

Traceback (most recent call last):
 File "C:\Users\Ejah\Downloads\Desktop\Tunebot-Master\tinychat.py", line     1262
in onMessage
  SETTINGS['onMessageExtend'](self, user, msg)
 File "tunebot.py", line 1316, in onMessageExtended
  handleUserCommand(room, user, msg)
 File "tunebot.py", line 1722, in handleUserCommand
  res = botterCommands(room, userCmd, userArgsStr, userArgs, target,
 File "tunebot.py", line 2786, in botterCommands
  res = approveCam(room, user)
 File "tunebot.py", line 4043, in approveCam
  if user.broadcasting:
UnboundLocalError: local variable 'user' referenced before assignment"

Answer 1

當identifier為無效類型並且所有內容都將變得清楚時，請更新代碼以引發錯誤：

def approveCam(room, identifier):
    if not room.bpass:
        return

    if type(identifier) in [str, unicode, int]:
        user = room._getUser(identifier)
        if not user:
            return "User " + str(identifier) + " was not found..."
    else:
        raise ValueError('Invalid type for identifier')

    if user.broadcasting:
        return

    room._sendCommand("privmsg", [room._encodeMessage("/allowbroadcast " + room.bpass),
        "#0,en" + "n" + str(user.id) + "-" + user.nick])

Answer 2

user.broadcasting - This is not correct

此時，用戶不存在，因此解釋器不允許這樣做。 您必須先初始化局部變量，然后才能使用它們。

使用戶成為具有某些值的全局變量。

Answer 3

if type(identifier) in [str, unicode, int]:可能為False ，那么if的主體將不會執行，並且user也不會被初始化。

初始化user之前第二if可能的話，或重新考慮你的代碼。

PS不要使用getter和setter！ Python不是Java，如果確實需要使用它們，請改用屬性。