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Evaluate the Mathematical Expressions using Tkinter in Python

  • Last Updated : 15 Nov, 2021

This article focuses on evaluation of mathematical expression using the Tkinter  and math packages in Python. 

Tkinter: Python Tkinter is a GUI programming package or built-in package. Tkinter provides the Tk GUI toolkit with a potent object-oriented interface. Python with tkinter is the fastest and easiest way to create the GUI applications. Creating a GUI using tkinter is an easy task. 

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Math module: In python, a variety of mathematical operations can be carried out with ease by importing a python  module called “math” that specifies various functions, making our tasks simpler. 

Steps involved in conversion of temperature:

  • Importing the  tkinter & math packages.
  • Create the main window.
  • Add number of widgets to the main window : Entry , Label.
  • Evaluating the expression.
  • Displaying message.
  • Apply the event trigger on the widgets.


# Importing tkinter module as tk
import tkinter as tk
# Importing all functions/methods
# from math module
from math import *
# Import messagebox class from tkinter
from tkinter import messagebox
# function for evaluating the expression
def eval_expression(event):
    result.configure(text = " Result: " +
    messagebox.showinfo("Evaluate Expression",
                        "Successfully evaluated" )
# creating Tk window
root = tk.Tk()
# set geometry of root window
# set the title of root window
root.title('Evaluate Expression')
# label and entry field
input_label = tk.Label(root,
                      text = " Enter Your Expression:",).grid(row = 1)
entry = tk.Entry(root)
# bind 'enter' event to the
# eval_expression() through
# entry widget


Evaluate expression gui

Evaluate expression gui

Evaluate expression working

Evaluate expression working


Below is a video which demonstrates the execution of the code in PyCharm:

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