CODEWITHSUNDEEP
pythonpython-3.xtkinter
user8544485
user8544485

Reputation:

How do I return variables from a function in Tkinter?

I have been trying to make a simple dice rolling GUI where you press a button and a dice rolls and gives you the output in a label. When I run my code I get the error that "diceOutput" is not defined. Here is my code:

from tkinter import *
import random

window = Tk()

window.title("Dice")

def rollDice():
    diceOutput = str(random.randint(1,6))
    return diceOutput

roll = Button(window, text="Roll", command=rollDice)
output = Label(window, textvariable=diceOutput)

window.mainloop()

Upvotes: 0

Views: 866

Answers (2)

furas
furas

Reputation: 142641

As Reblochon Masque showed you don't need textvariable= to change text in Label

... but if you use textvariable= then you have to use class StringVar() / IntVar() / etc.
and you have to use variable.set() to change value in StringVar() / IntVar() / etc.
and it will change text in Label

(BTW: to get value you have to use variable.get())

import tkinter as tk
import random

# --- functions ---

def roll_dice():
    dice_output.set( random.randint(1, 6) )

# --- main ---

window = tk.Tk()
window.title("Dice")

roll = tk.Button(window, text="Roll", command=roll_dice)
roll.pack()

dice_output = tk.StringVar()

output = tk.Label(window, textvariable=dice_output)
output.pack()

window.mainloop()

Upvotes: 0

Reblochon Masque
Reblochon Masque

Reputation: 36682

You need to include the label and button in the window, using a layout manager. Here I used .pack()

You do not need the global variable diceOutput.

Then you need to assign the new dice roll to the text label, once the button has been clicked:

from tkinter import *
import random

window = Tk()
window.title("Dice")

def rollDice():
    dice_roll_result = str(random.randint(1,6))
    outlbl['text'] = dice_roll_result

roll = Button(window, text="Roll", command=rollDice)
roll.pack()
outlbl = Label(window, text='')
outlbl.pack()

window.mainloop()

Upvotes: 1

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