python - UnboundLocalError继续弹出，我不知道为什么

终端输出一个错误，提示local variable 'Listener' referenced before assignment。我正在尝试导入监听器from pynput.keyboard import Listener

我尝试重新编写程序并更改导入

import os
import time
from threading import Thread, Timer

from mss import mss
from pynput.keyboard import Listener

class IntervalTimer(Timer):
    def run(self):
        while not self.finished.wait(self.interval):
            self.function(*self.args, **self.kwargs)

class Monitor:
    def _on_press(self, K):
        with open("./log/keylogs/log.txt", "a")as f:
            f.write("{} \t\t {}\n".format(K, time.time()))

    def _build_logs(self):
        if not os.path.exists("./logs"):
            os.mkdir("./logs")
            os.mkdir("./logs/screenshots")
            os.mkdir("./log/keylogger")

    def _keylogger(self):
        with Listener(on_press = self._on_press)as Listener:
            Listener.join()

    def _screenshot(self):
        sct = mss()
        sct.shot(output="./logs/screenshots/{}.png".format(time.time()))

    def run(self, interval = 1):
        self._build_logs()
        Thread(target=self._keylogger).start()
        IntervalTimer(interval, self._screenshot).start()

if __name__ == "__main__":
    mon = Monitor()
    mon.run()

这是错误

    with Listener(on_press = self._on_press)as Listener:
UnboundLocalError: local variable 'Listener' referenced before assignment

最佳答案

问题是您在Listener中重新定义了_keylogger。有关说明，请参见Python常见问题解答中的Why am I getting an UnboundLocalError when the variable has a value?或Don't understand why UnboundLocalError occurs

要解决此问题，只需更改Listener实例的名称。无论如何，实例通常都以小写形式编写。

with Listener(on_press=self._on_press) as listener:
    listener.join()

关于python - UnboundLocalError继续弹出，我不知道为什么，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/58368019/