python - Tkinter 消息框在按下“确定/确认”后不会消失

Question

我写了一个小脚本来跟踪我设备的电池容量。主要用于学习 Python。

我决定使用循环来识别低容量。到目前为止没问题，但是当我使用 tkinter messagebox 时，在我确认警告后窗口不会消失。

import os
from time import sleep
import tkinter as tk 
from tkinter import *
from tkinter import messagebox

stat = "/sys_vars/status"
plugged = "PLUGGED"
unplugged = "UNPLUGGED"
batfile = "/sys_vars/capa"

root = tk.Tk() 
root.withdraw() 

def read(sysfile):
    with open(sysfile, "r") as f:
        return f.read()

def loopcheck():
    plug = str(read(stat).strip())
    bat = int(read(batfile))
    if plug == plugged:
        sleep(2)
    if plug == unplugged and 6 <= bat <= 15:
        messagebox.showwarning("Alert!","Battery Low!\nCharging  Required!")
        sleep(2)
    if plug == unplugged and bat <= 5:
        messagebox.showwarning("ALERT!","Battery ULTRA Low!\nCharging  Required!")
        sleep(2)

if __name__ == "__main__":
    messagebox.showinfo("Running!","Battry Status Tracker is now running on machine")
    while True: 
        loopcheck()

我希望我确认警告，然后在几秒后显示消息。

示例中的变量和短 sleep 定时器用于测试。

Answer 1

您应该使用 root.after(2000, loopcheck) 来延迟运行函数，而不是 while True 和 sleep(2)。它不会阻塞 root.mainloop()，它必须一直运行以从系统获取键/鼠标事件，将事件发送到小部件并重绘窗口/小部件。

我没有这些 /sys_vars 来测试它，但它可能是这样的:

import tkinter as tk 
from tkinter import messagebox

stat = "/sys_vars/status"
plugged = "PLUGGED"
unplugged = "UNPLUGGED"
batfile = "/sys_vars/capa"

def read(sysfile):
    with open(sysfile, "r") as f:
         return f.read()

def loopcheck():
    plug = str(read(stat).strip())
    bat  = int(read(batfile))

    if plug == unplugged:
        if 6 <= bat <= 15:
            messagebox.showwarning("Alert!","Battery Low!\nCharging  Required!")
        elif bat <= 5:
            messagebox.showwarning("ALERT!","Battery ULTRA Low!\nCharging  Required!")

    root.after(2000, loopcheck)

if __name__ == "__main__":

    root = tk.Tk() 
    root.withdraw() 

    messagebox.showinfo("Running!","Battry Status Tracker is now running on machine")
    root.after(2000, loopcheck)

    root.mainloop()