Compound Interest GUI Calculator using Tkinter

# importing classes and 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)

#code

if __name__ == "__main__" :

# Create a GUI window

root = Tk()

# Set the background colour of GUI window

root.configure(background = 'white')

# 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 = 'white', bg = 'black')

# Create a Rate : label

label2 = Label(root, text = "Rate(%) : ",

fg = 'white', bg = 'black')

# Create a Time : label

label3 = Label(root, text = "Time(years) : ",

fg = 'white', bg = 'black')

# Create a Compound Interest : label

label4 = Label(root, text = "Compound Interest : ",

fg = 'white', bg = 'black')

# 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()