How do I use grid_forget more than once in tkinter?

Question

I'm trying to give myself Excercises using imports and keeping programs and modules separate from each other. In this particular excercise I've given myself, I have a basic feet-to-inches and inches-to-feet converter.

Everything works except for one problem. Where the answer is displayed on the GUI, a new answer covers the old answer, rather than replace.

import tkinter as tk
from tkinter import E, W
import Converter

window = tk.Tk()
window.title("Converter")
answer_label = tk.Label(window, text="No Answer")
answer_label.grid(row=5)

def feet_to_inches_function(old_label):
    old_label.grid_forget()
    answer_label = tk.Label(window, text=Converter.feet_to_inches(int(entry_bar.get())))
    answer_label.grid(row=5)

def inches_to_feet_function(old_label):
    old_label.grid_forget()
    answer = tk.Label(window, text=Converter.inches_to_feet(int(entry_bar.get())))
    answer.grid(row=5)

title_label = tk.Label(window, text="Convert")
entry_bar = tk.Entry(window, font=('HELVETICA', 10))
fti_button = tk.Button(window, text="Feet to Inches", command=lambda: feet_to_inches_function(answer_label))
itf_button = tk.Button(window, text="Inches to Feet", command=lambda: inches_to_feet_function(answer_label))
quit_button = tk.Button(window, text="Quit", command=window.destroy)

title_label.grid(row=0, column=0, sticky=W)
entry_bar.grid(row=1, columnspan=2, sticky=(E, W))
fti_button.grid(row=3, column=0)
itf_button.grid(row=3, column=1)
quit_button.grid(row=4, columnspan=2, sticky=(E, W))

window.mainloop()

Also as a separate question,I'm having a hard time understanding mainloop.I know that it makes the program go in an infinate loop, but from where? I don't see any logical evidence that shows that my code is on an endless loop.

Thanks so much

You don't need to recreate the answer label, just update its text with the answer. — acw1668, Feb 11 '20 at 11:43
First you have to understand [Event-driven programming](https://stackoverflow.com/a/9343402/7414759) — stovfl, Feb 11 '20 at 11:53
Okay, so how would I go about updating the text with the answer? — Maz, Feb 11 '20 at 12:24

DaniyalAhmadSE · Accepted Answer · 2020-02-12T07:58:34.797

Here's a solution for you:

import tkinter as tk
from tkinter import E, W


window = tk.Tk()
window.title("Converter")
answer_label = tk.Label(window, text="No Answer")
answer_label.grid(row=5)


def feet_to_inches_function():
    answer_label.configure(text='As you want (INCHES)')


def inches_to_feet_function():
    answer_label.configure(text='As you want (FEET)')


title_label = tk.Label(window, text="Convert")
entry_bar = tk.Entry(window, font=('HELVETICA', 10))
fti_button = tk.Button(window, text="Feet to Inches", command=feet_to_inches_function)
itf_button = tk.Button(window, text="Inches to Feet", command=inches_to_feet_function)
quit_button = tk.Button(window, text="Quit", command=window.destroy)

title_label.grid(row=0, column=0, sticky=W)
entry_bar.grid(row=1, columnspan=2, sticky=(E, W))
fti_button.grid(row=3, column=0)
itf_button.grid(row=3, column=1)
quit_button.grid(row=4, columnspan=2, sticky=(E, W))

window.mainloop()

All you need is to configure the text of the Label in both functions.

It is because you called `old_label.grid_forget()` which should not be called as well. — acw1668, Feb 11 '20 at 14:03

How do I use grid_forget more than once in tkinter?

1 Answers1