Python TKINTER label not showing up

Question

I have the following code that I wrote for a calculator for my college coding class. For some reason, the label I added does not show up. I inititally used a text box, which I couldn't update, before switching it to a label. Can anyone tell me why it is not appearing? I can't see any reason why it wouldn't be showing up there.

from tkinter import *

root = Tk()
root.geometry('100x100')
root.title("calculator")




display ="0"
holder = "0"
operand = 0

text_box = Label(
  
    textvariable = display

)
text_box.grid(row = 0, column = 0)





def adddigit(num):
    global display
    if display == "0":
        display = num
    else:
        display += num
    print(display)
        
def add():
    global display
    global holder
    global operand
    holder = display
    operand = 1
    display = "0"
    

def subtract():
    global display
    global holder
    global operand
    holder = display
    operand = 2
    display = "0"
def solve():
    global display
    global holder
    global operand
    if operand == 1:
        display = str(int(display) + int(holder))
    elif operand == 2:
        holder = str(int(holder)-int(display))
        display = holder
    
        
    print(display)
btnTest = Button(text = display)
btnTest.grid(row=0,column=1)
btn1 = Button(text = "1", command = lambda: adddigit("1"))
btn1.grid(row=1,column=0)
btn2 = Button(text = "2", command = lambda: adddigit("2"))
btn2.grid(row=1,column=1)
btn3 = Button(text = "3", command = lambda: adddigit("3"))
btn3.grid(row=1,column=2)
btn4 = Button(text = "4", command = lambda: adddigit("4"))
btn4.grid(row=2,column=0)
btn5 = Button(text = "5", command = lambda: adddigit("5"))
btn5.grid(row=2,column=1)
btn6 = Button(text = "6", command = lambda: adddigit("6"))
btn6.grid(row=2,column=2)
btn7 = Button(text = "7", command = lambda: adddigit("7"))
btn7.grid(row=3,column=0)
btn8 = Button(text = "8", command = lambda: adddigit("8"))
btn8.grid(row=3,column=1)
btn9 = Button(text = "9", command = lambda: adddigit("9"))
btn9.grid(row=3,column=2)
btn0 = Button(text = "0", command = lambda: adddigit("0"))
btn0.grid(row=4,column=1)
btnadd = Button(text = "+", command = add)
btnadd.grid(row = 5, column = 0)
btnsub = Button(text = "-", command = subtract)
btnsub.grid(row = 5, column = 1)
btnsolve = Button(text = "=", command = solve)
btnsolve.grid(row = 5, column = 2)

I Like Python · Accepted Answer · 2022-05-12 02:52:31Z

1

The variable passed to the textvariable parameter shouldn't be a string, it should be a tkinter.StringVar() object.

Add the line label_show = tkinter.StringVar(), change the label line to text_box = Label(textvariable=label_show), then at the end of each function, add label_show.set(display)

edited May 12, 2022 at 2:52

answered May 12, 2022 at 2:42

I Like Python

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3 Comments

Robbie Croop Over a year ago

Running this tells me that "name 'tkinter' is not defined." I've tried replacing tkinter with some other words, but none of them seem to work. Do you know what to do? By the way, thank you for telling me about stringvar, it was very helpful

Rory Over a year ago

This is cause by your import statement from tkinter import* which should be discouraged. It imports the entire module. For your import you would only call StringVar() and omit the tkinter. before it. You should import with its own namespace like import tkinter as tk and then you call tk before your module calls like tk.StringVar().

I Like Python Over a year ago

Sorry, I didn't notice you used from tkinter import *.

TheRavenSpectre · Accepted Answer · 2022-05-12 02:35:41Z

0

You need to do:

text_box=Label(root, textvariable=display)
text_box.grid(column=0, row=0)

answered May 12, 2022 at 2:35

TheRavenSpectre

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