Python Tkinter 无需全局变量实现Button1触发成功后才可执行Button2功能

原代码的核心问题是：button_1_pressed是button_1函数内的局部变量，函数执行结束后就会被销毁，button_2无法访问该变量，因此无法实现状态判断逻辑。

以下两种实现方案均不使用全局变量，也不会让Button2执行Button1的逻辑： #

方案1：窗口自定义属性存储状态 #

和你原有逻辑适配度最高，改动最小：

import tkinter as tk
from sys import exit

window = tk.Tk()
# 状态直接绑定在窗口对象上，不属于全局变量
window.button_1_success = False

def button_1():
    print("Button 1 pressed")
    # 此处写Button1的业务逻辑，只有逻辑执行成功再修改状态
    window.button_1_success = True

def button_2():
    if window.button_1_success:
        print("Button 1 was pressed, taking action")
        # Button2的业务逻辑写在此处
    else:
        print("Button 1 was NOT pressed, no action is done")

btn_1 = tk.Button(master=window, text="Button 1", width=10, height=2, command=button_1)
btn_1.pack()

btn_2 = tk.Button(master=window, text="Button 2", width=10, height=2, command=button_2)
btn_2.pack()

btn_Close = tk.Button(master=window, text="Close", width=10, height=2, command=exit)
btn_Close.pack()

window.mainloop()

方案2：按钮状态控制（交互更优） #

默认禁用Button2，只有Button1执行成功后才启用Button2，用户可以直观感知到按钮是否可点击，不需要点击后才收到提示：

import tkinter as tk
from sys import exit

window = tk.Tk()

def button_1():
    print("Button 1 pressed")
    # 此处写Button1的业务逻辑，只有逻辑执行成功再启用Button2
    btn_2.config(state=tk.NORMAL)

def button_2():
    print("Button 1 was pressed, taking action")
    # Button2的业务逻辑写在此处

btn_1 = tk.Button(master=window, text="Button 1", width=10, height=2, command=button_1)
btn_1.pack()

# 初始状态禁用Button2
btn_2 = tk.Button(master=window, text="Button 2", width=10, height=2, command=button_2, state=tk.DISABLED)
btn_2.pack()

btn_Close = tk.Button(master=window, text="Close", width=10, height=2, command=exit)
btn_Close.pack()

window.mainloop()

内容的提问来源于stack exchange，提问作者SG-Lars