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

问题描述

我想制作一个按钮，在每次点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，在每次点击后向文本"添加 +1 直到 4和一个按钮.代码不返回函数的值，按钮只有 text = 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()

我希望你能帮助我:)

推荐答案

首先

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

将 None 分配给 btn 因为 grid() 返回 None

assigns None to btn because grid() returns None

使用

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

现在您可以使用 btn['text'] = "new text" 或 btn.config(text="new text")

Now you can change text on button using btn['text'] = "new text" or btn.config(text="new text")

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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