python按钮单击后更改文本 [英] python button change text after click

问题描述

我想创建一个Button，每次单击后更改显示的文本（数字）并返回函数中定义的值，因为我想使用显示的变量。

i want to make a Button that changes the displayed text(number) after every click and returns the valure defined in the function, because i want to work with the displayed variables.

我创建了一个函数，每次单击后将+1添加到文本中，直到4
和一个按钮为止。代码不返回函数的值，按钮仅包含文本= 1,2,3或4。

I created a function that adds +1 to "text" after every click until 4 and a button. The code does not return the valure of the function and the button has only the text = 1,2,3 or 4.

import tkinter as tk

root = tk.Tk()

text = 0
def text_change():
    global text
    text += 1

    print(text)
    if text >= 4:
        text = 0

#to change: button text has to be the variable defined in the function
btn = tk.Button(text = "1,2,3 or 4", width = 10, height = 3, command = \
                text_change).grid(row = 1 , column = 1)

root.mainloop()

I希望您能帮到我：）

I hope you can help me :)

推荐答案

首先

btn = tk.Button(...).grid(..)

将无分配给 btn ，因为 grid（）返回无

使用

btn = tk.Button(...)
btn.grid(...)

现在，您可以使用 btn ['text'] =新文本 或 btn.config（text = 新文本）

import tkinter as tk

# --- functions ---

def text_change():
    global text

    text += 1

    if text > 4:
        text = 1

    print("changed to:", text)

    #btn['text'] = text
    btn.config(text=text)

def text_print():
    print("current:", text)

# --- main ---

text = 0

root = tk.Tk()

btn = tk.Button(text="1,2,3 or 4", command=text_change, width=10, height=3)
btn.grid(row=1, column=1)

btn2 = tk.Button(text="SHOW", command=text_print, width=10, height=3)
btn2.grid(row=2, column=1)

root.mainloop()

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