python button change text after click

Question

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.

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 hope you can help me :)

btw: btn = tk.Button(...).grid(..) always assigns None to btn. Use use btn = tk.Button(...) ; btn.grid(...) — furas
– furas, Commented Nov 26, 2015 at 13:45

furas · Accepted Answer · 2015-11-26 15:30:06Z

1

First

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

assigns None to btn because grid() returns None

use

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

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()

edited Nov 26, 2015 at 15:30

answered Nov 26, 2015 at 13:55

furas

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8 Comments

FastBatteryCharger Over a year ago

thank you! Do you know how to assigne the 1,2,3 or 4 to a variable ? So i can work with the variables

furas Over a year ago

I don't know what you mean. You already have text variable and you can work with it.

FastBatteryCharger Over a year ago

yea but i think the text value in "text_change()" is local, so the text = 0 ist always 0. And i want to overwrite the text = 0 with the text-value of "text_change()"

FastBatteryCharger Over a year ago

as an example my code : a = text if a == 1: print("kkk") doesnt work

furas Over a year ago

text is not local because I used global text

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