tkinter: getting label widget to display output

Question

I have a GUI with two entry boxes: one for "miles at last oil change" and one for "current miles". There's a button which, upon clicked, runs a function that reads input from the entry boxes and prints how many miles I am due or past due, etc. I want to display the output to the GUI. I know I have to create a label widget but how do I make it so that when I press the button and the function gets called, the label text gets updated with info from the function?

from tkinter import *
from tkinter import ttk


#initializing root window
root = Tk()
root.title("Car Maintenance App")

#functions
miles = IntVar()
last_miles = IntVar()

def check_oil_change():
    miles = miles_entry.get()
    miles = int(miles)
    last_miles = lastmiles_entry.get()
    last_miles = int(last_miles)
    miles_till_oilchange = 3000 - (miles - last_miles)
    if miles_till_oilchange == 0:
        print("You are due for an oil change")
    if miles_till_oilchange > 0:
        print("You have {} miles until next oil change.".format(miles_till_oilchange))
    if miles_till_oilchange < 0:
        print("You are over due {} miles for an oil change.".format(abs(miles_till_oilchange)))

#creating container for widgets
mainframe = ttk.Frame(root, padding="3 3 12 12")
mainframe.grid(column=0, row=0, sticky=(N, W, E, S))
root.columnconfigure(0, weight=1)
root.rowconfigure(0, weight=1)

#widgets
milesLabel = ttk.Label(mainframe, text= "Enter your cars current mileage:")
lastmilesLabel = ttk.Label(mainframe, text= "How many miles was your last oil change at?")

miles_entry = ttk.Entry(mainframe, width=7)
lastmiles_entry = ttk.Entry(mainframe, width=7)

milesButton = ttk.Button(mainframe, text="Enter", command=check_oil_change)

#positioning
milesLabel.grid(row=1, column=0)
miles_entry.grid(row=1, column=1)
milesButton.grid(row=1, column=2)
lastmilesLabel.grid(row=0, column=0)
lastmiles_entry.grid(row=0, column=1)

root.mainloop()

Hello and welcome to StackOverflow! On a side note, I notice that you're using both snake casing and camel casing. I would pick one (or, say, use camel casing for functions and snake casing for everything else). — Daniel Walker
– Daniel Walker, Commented Jul 25, 2021 at 17:51
@DanielWalker Thank you! I'll probably switch to using snake casing exclusively. I don't know why I used both. — owwix
– owwix, Commented Jul 25, 2021 at 18:24

user15801675 · Accepted Answer · 2021-07-25 17:50:02Z

In that case, you casn define a label, and use .config() method.

.config() method allows you to configure the specified widget. You can edit any parameters of the widget.

from tkinter import *
from tkinter import ttk

#initializing root window
root = Tk()
root.title("Car Maintenance App")

#functions
miles = IntVar()
last_miles = IntVar()

def check_oil_change():
    miles = miles_entry.get()
    miles = int(miles)
    last_miles = lastmiles_entry.get()
    last_miles = int(last_miles)
    miles_till_oilchange = 3000 - (miles - last_miles)

    if miles_till_oilchange == 0:
        mile_lbl.config(text="You are due for an oil change")

    elif miles_till_oilchange > 0:
        mile_lbl.config(text="You have {} miles until next oil change.".format(miles_till_oilchange))

    elif miles_till_oilchange < 0:
        mile_lbl.config(text="You are over due {} miles for an oil change.".format(abs(miles_till_oilchange)))



#creating container for widgets
mainframe = ttk.Frame(root, padding="3 3 12 12")
mainframe.grid(column=0, row=0, sticky=(N, W, E, S))
root.columnconfigure(0, weight=1)
root.rowconfigure(0, weight=1)

#widgets
milesLabel = ttk.Label(mainframe, text= "Enter your cars current mileage:")
lastmilesLabel = ttk.Label(mainframe, text= "How many miles was your last oil change at?")

miles_entry = ttk.Entry(mainframe, width=7)
lastmiles_entry = ttk.Entry(mainframe, width=7)

milesButton = ttk.Button(mainframe, text="Enter", command=check_oil_change)
mile_lbl=Label(mainframe,font=("arial","bold"))

#positioning
milesLabel.grid(row=1, column=0)
miles_entry.grid(row=1, column=1)
milesButton.grid(row=1, column=2)
mile_lbl.grid(row=2,column=0)
lastmilesLabel.grid(row=0, column=0)
lastmiles_entry.grid(row=0, column=1)

root.mainloop()

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