[Tkinter] Make my button text update?

[Skata100]

So i have an integer 'bankValue' that is increased by a function 'addToBank'.

The buttons text displays 'bankValue', and should update upon click, but doesn't.

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from tkinter import * import tkinter.messagebox as mb import os   # the in-game bank value, your total 'currency' bankValue = 0   # function that decides how much to add to bankValue def addToBank(amount):     global bankValue     bankValue += amount   # "gameWindow" = tk interface gameWindow = Tk()   # heightxwidth of interface gameWindow.geometry("500x250")   # title on top bar gameWindow.title("WTFIT v0.05")   # button click = bankValue + amount (amount can be changed) button1 = Button(gameWindow, command=addToBank(1), text=bankValue, width = 10, height = 2, bg = 'cyan')   # placement of button button1.place(x=100, y=25)   # shows whats happening gameWindow.mainloop()

I want the button to increase the value of 'bankValue', and display it as well.
I don't need it to display on the button either, if I can have that number display anywhere that would be awesome.


Thank you!
- Skata100

[deanhystad]

The easiest way to do this is make bankValue a StringVar or IntVar. In this example I make it a StringVar so I can format it to have two decimal places.

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import tkinter as tk   def addToBank(amount):     balance = float(bankValue.get()) + amount     bankValue .set(f'{balance:.2f}')   gameWindow = tk.Tk() bankValue = tk.StringVar() bankValue.set('0.00') button1 = tk.Button(gameWindow, command=lambda:addToBank(1.25), textvariable=bankValue) button1.pack()   gameWindow.mainloop()

This code sets your callback function to None.

1	command=addToBank(1)

command is None because addToBank(1) calls the function and uses the return value (None) and the value for command. You probably wanted this:

1	command=addToBank

But this does not provide an argument for "amount" in addToBank(). You could get around this by providing a default value for amount.

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def addToBank(amount=1.25):     balance = float(bankValue.get()) + amount     bankValue .set(f'{balance:.2f}')

You can also use a lambda expression to bind an argument to the function. The same kind of thing can be done using functools.partial