Build a desktop app with Python

Screenshot of final GUI

What is Tkinter?

Tkinter is the standard GUI library for Python. Python when combined with Tkinter provides a fast and easy way to create GUI applications. Tkinter provides a powerful object-oriented interface to the Tk GUI toolkit. (Source: Link)

Let’s setup the environment to build a simple desktop application


  • Python
  • Tkinter
  • pyinstaller

Let’s start the coding!

1. Import tkinter

import tkinter as tk

2. Creating a window

  • title() is used to assign the title for the window.
  • geometry() is for the dimensions of the window
root = tk.Tk()
root.title("Desktop Application")

3. Creating a label

  • tk.label() is used to display text in the GUI window
label = tk.Label(root, width=22, text="Addition of two numbers", anchor='w')
label.pack(side=tk.TOP, pady = 30)

4. Creating entry text field

  • For labels, UI can be enhanced by adding .config()
  • tk.Entry() is used to take single-line values from the user
row = tk.Frame(root)
label = tk.Label(row, width=22, text="Number 1", anchor='w')

validation = row.register(only_numbers)
number1 = tk.Entry(row, validate="key", validatecommand=(validation, %S'))

row.pack(side=tk.TOP, fill=tk.X, padx=5, pady=5)
number1.pack(side=tk.RIGHT, expand=tk.YES, fill=tk.X)

row2 = tk.Frame(root)
label2 = tk.Label(row2, width=22, text="Number 2", anchor='w')
validation = row2.register(only_numbers)
number2 = tk.Entry(row2, validate="key", validatecommand=(validation, '%S'))

row2.pack(side=tk.TOP, fill=tk.X, padx=5, pady=5)
number2.pack(side=tk.RIGHT, expand=tk.YES, fill=tk.X)

5. Adding a function for validation

  • As we are developing an addition function, we validate if the input values are only numbers (integer and float)
def only_numbers(char):
return char.replace(".", "0", 1).isdigit()

6. Adding a button to click for addition

  • tk.Button() is for creating a button and the parameter command works as on click command function
b1 = tk.Button(root, width = 15, text='Add', background = "Light green", command=(lambda: add_val()))
b1.config(font=("Raleway", 18))
b1.pack(side=tk.RIGHT, padx=5, pady=5)

7. Adding a function for finding sum

def add_val():
added_val = int(number1.get()) + int(number2.get())
label3 = tk.Label(root, width=60, text = "SUM " + str(added_val), anchor = 'w')
label3.pack(side=tk.LEFT, padx=150, ipady = 100)

Get the complete code at:

We are done with developing the application, lets run the code and check out the GUI (Graphical User Interface)

Output GUI using Tkinter

As a final step let’s generate an executable file and you are good to share your work !!

  1. Open the command prompt and navigate to the folder in which you have your python script
  2. Execute the following code
pyinstaller --onefile

3. Check the .exe file in the dist folder

Hurray!! You have generated your first desktop application using Python and Tkinter



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