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Python – Compound Interest GUI Calculator using Tkinter

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  • Last Updated : 11 Jun, 2021
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Prerequisites : Introduction to tkinter | Program to calculate compound interest

Python offers multiple options for developing a GUI (Graphical User Interface). Out of all the GUI methods, Tkinter is the most commonly used method. In this article, we will learn how to create a Compound Interest GUI Calculator application using Tkinter, with a step-by-step guide.
 

To create a Tkinter: 

  • Importing the module – tkinter
  • Create the main window (container)
  • Add any number of widgets to the main window.
  • Apply the event Trigger on the widgets.

Below is what the GUI will look like:

Let’s create a GUI based Compound Interest Calculator application.
 

Below is the implementation :
 

Python3




# import all classes / functions from the tkinter
from tkinter import *
 
# Function for clearing the 
# contents of all entry boxes  
def clear_all() :
 
    # whole content of entry boxes is deleted
    principle_field.delete(0, END)  
    rate_field.delete(0, END)
    time_field.delete(0, END)
    compound_field.delete(0, END)
   
    # set focus on the principle_field entry box 
    principle_field.focus_set()
 
 
# Function to find compound interest 
def calculate_ci():
 
    # get a content from entry box
    principle = int(principle_field.get())
     
    rate = float(rate_field.get())
 
    time = int(time_field.get())
     
    # Calculates compound interest 
    CI = principle * (pow((1 + rate / 100), time))
 
    # insert method inserting the 
    # value in the text entry box.
    compound_field.insert(10, CI)
 
     
 
# Driver code
if __name__ == "__main__" :
   
    # Create a GUI window
    root = Tk()
   
    # Set the background colour of GUI window
    root.configure(background = 'light green')
   
    # Set the configuration of GUI window
    root.geometry("400x250")
   
    # set the name of tkinter GUI window
    root.title("Compound Interest Calculator"
       
    # Create a Principle Amount : label
    label1 = Label(root, text = "Principle Amount(Rs) : ",
                   fg = 'black', bg = 'red')
   
    # Create a Rate : label
    label2 = Label(root, text = "Rate(%) : ",
                   fg = 'black', bg = 'red')
       
    # Create a Time : label
    label3 = Label(root, text = "Time(years) : ",
                   fg = 'black', bg = 'red')
 
    # Create a Compound Interest : label
    label4 = Label(root, text = "Compound Interest : ",
                   fg = 'black', bg = 'red')
 
    # grid method is used for placing 
    # the widgets at respective positions 
    # in table like structure .
 
    # padx keyword argument used to set padding along x-axis .
    # pady keyword argument used to set padding along y-axis .
    label1.grid(row = 1, column = 0, padx = 10, pady = 10
    label2.grid(row = 2, column = 0, padx = 10, pady = 10
    label3.grid(row = 3, column = 0, padx = 10, pady = 10)
    label4.grid(row = 5, column = 0, padx = 10, pady = 10)
 
    # Create a entry box 
    # for filling or typing the information.
    principle_field = Entry(root) 
    rate_field = Entry(root) 
    time_field = Entry(root)
    compound_field = Entry(root)
 
    # grid method is used for placing 
    # the widgets at respective positions 
    # in table like structure .
     
    # padx keyword argument used to set padding along x-axis .
    # pady keyword argument used to set padding along y-axis .
    principle_field.grid(row = 1, column = 1, padx = 10, pady = 10
    rate_field.grid(row = 2, column = 1, padx = 10, pady = 10
    time_field.grid(row = 3, column = 1, padx = 10, pady = 10)
    compound_field.grid(row = 5, column = 1, padx = 10, pady = 10)
 
    # Create a Submit Button and attached 
    # to calculate_ci function 
    button1 = Button(root, text = "Submit", bg = "red"
                     fg = "black", command = calculate_ci)
   
    # Create a Clear Button and attached 
    # to clear_all function 
    button2 = Button(root, text = "Clear", bg = "red"
                     fg = "black", command = clear_all)
   
    button1.grid(row = 4, column = 1, pady = 10)
    button2.grid(row = 6, column = 1, pady = 10)
 
    # Start the GUI 
    root.mainloop()
    

Output : 
 


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