GUI for simple python project

[menator01]

I did a version that updates the label as well.

import tkinter as tk
from tkinter import messagebox

root = tk.Tk()
root['padx'] = 8

def error_message(arg):
    messagebox.showerror('Errror!', f'{arg} is not permitted')

my_var = tk.StringVar()
nvar = tk.StringVar()
nvar.set('Hours: 0 Minutes: 0')

def _time(var, index, mode):
    try:
        hrs = int(float(my_var.get()))
        minutes = int(float(my_var.get())*60%60)
        nvar.set(f'Hours: {hrs} Minutes: {minutes}')
    except ValueError:
        error_message(my_var.get())
        my_var.set('')

my_var.trace_add('write', _time)

entry = tk.Entry(root, width=50, textvariable=my_var)
entry.grid(column=0, row=0, pady=5)
entry.focus()

label = tk.Label(root, textvariable=nvar)
label.grid(column=0, row=1, pady=5, sticky='w')

root.mainloop()