Python Tkinter线程按钮命令和主循环

Question

我正在使用Tkinter创建一个键盘记录器（仅用于教育目的），我尝试实现线程，所以当我按下按钮时，键盘记录器会在运行root.mainloop（）时运行。

代码是：

import keylogger
import time
from Tkinter import *
import threading

now = time.time()
done = lambda: time.time() < now + -1

def print_keys(modifiers, keys): print "%r   %r" % (keys, modifiers)  

def key():
    sys.stdout = open('keylogger.txt', 'w')
    keylogger.log(done, print_keys)

def keystop():
    sys.stdout.close()
    sys.exit()

def loop():
    root.mainloop()

def ft():
    pt = threading.Thread(target = key)
    ct = threading.Thread(target = loop)
    pt.start()
    ct.start()


root = Tk()
button1 = Button(root, text = "Start", command = ft)
button1.pack()

button2 = Button(root, text = "Stop", command = keystop)
button2.pack()

root.mainloop()