Import the Tkinter module to create a graphical user interface.

import tkinter as tk

Initialize the main application window.

app_window = tk.Tk()
app_window.title('Number Adder')
app_window.geometry('500x500')

Add a label to guide user input.

input_label = tk.Label(app_window, text='Enter numbers separated by commas:', width=45, font=('Arial', 22))
input_label.place(x=10, y=20)

Create an entry field for user input.

entry_label = tk.Label(app_window, text='Input values:')
entry_label.place(x=20, y=60)
input_entry = tk.Entry(app_window, width=25)
input_entry.place(x=150, y=60)

Add a label to display the calculation result.

result_label = tk.Label(app_window, text='Result:', width=45, font=('Arial', 22))
result_label.place(x=10, y=100)

Use a varialbe to store and update the result dynamically.

result_var = tk.DoubleVar()
result_display = tk.Label(app_window, textvariable=result_var, width=45)
result_display.place(x=150, y=230)
prefix_label = tk.Label(app_window, text='Sum:', width=10, font=('Arial', 18))
prefix_label.place(x=148, y=230)

Define a fucntion to compute the sum of entered numbers.

def calculate_sum():
    total = 0
    values = input_entry.get().split(',')
    for num in values:
        total += int(num)
    result_var.set(total)

Add a button to trigger the calculation.

calc_button = tk.Button(app_window, text='Compute Sum', width=30, command=calculate_sum, font=('Arial', 22))
calc_button.place(x=90, y=180)

Start the GUI event loop.

app_window.mainloop()