GST Rate Finder GUI using Python-Tkinter

Last Updated : 15 Jan, 2021

Prerequisites : Introduction to tkinter | Program to calculate GST
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 GST Rate Finder GUI 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 GST Rate Finder application :

Below is the implementation :

Python3

 
# import all functions/classes from the tkinter    
from tkinter import *
 
# Function for finding GST rate
def findGst() :
 
    # take a value from the respective entry boxes 
    # get method returns current text as string 
    org_cost= int(org_priceField.get())
    
    N_price = int(net_priceField.get())
 
    # calculate GST rate
    gst_rate = ((N_price - org_cost) * 100) / org_cost; 
 
    # insert method inserting the   
    # value in the text entry box. 
    gst_rateField.insert(10, str(gst_rate) + " % ") 
   
     
# Function for clearing the   
# contents of all text entry boxes 
def clearAll():
     
     
    # deleting the content from the entry box 
    org_priceField.delete(0, END)
     
    net_priceField.delete(0, END)
     
    gst_rateField.delete(0, END)
     
 
# Driver Code
if __name__ == "__main__" :
 
    # Create a GUI window 
    gui = Tk() 
   
    # Set the background colour of GUI window   
    gui.configure(background = "light green") 
   
    # set the name of tkinter GUI window  
    gui.title("GST Rate Finder") 
   
    # Set the configuration of GUI window 
    gui.geometry("300x300") 
 
    # Create a Original Price: label  
    org_price = Label(gui, text = "Original Price", 
                      bg = "blue")
   
    # Create a Net Price : label 
    net_price = Label(gui, text = "Net Price", 
                      bg = "blue") 
 
    # Create a Find Button and attached to 
    # findGst function 
    find = Button(gui, text = "Find", fg = "Black", 
                  bg = "Red", 
                  command = findGst)
     
    # Create a Gst Rate : label  
    gst_rate = Label(gui, text = "Gst Rate", bg = "blue") 
 
    # Create a Clear Button and attached to 
    # clearAll function 
    clear = Button(gui, text = "Clear", fg = "Black",
                   bg = "Red",
                   command = clearAll) 
 
    # grid method is used for placing   
    # the widgets at respective positions   
    # in table like structure .
 
    # padx attributed provide x-axis margin  
    # from the root window to the widget.
 
    # pady attributed provide y-axis 
    # margin from the widget. 
    org_price.grid(row = 1, column = 1,padx = 10,pady = 10)
                  
    net_price.grid(row = 2, column = 1, padx = 10, pady = 10)
    
    find.grid(row = 3, column = 2,padx = 10,pady = 10)
     
    gst_rate.grid(row = 4, column = 1,padx = 10, pady = 10)
     
    clear.grid(row = 5, column = 2, padx = 10, pady = 10)
 
    # Create a text entry box for filling or typing the information.   
    org_priceField = Entry(gui)
     
    net_priceField = Entry(gui)
     
    gst_rateField = Entry(gui)
 
    # grid method is used for placing   
    # the widgets at respective positions   
    # in table like structure . 
    org_priceField.grid(row = 1, column = 2 ,padx = 10,pady = 10)
     
    net_priceField.grid(row = 2, column = 2, padx = 10,pady = 10)
     
    gst_rateField.grid(row = 4, column = 2, padx = 10,pady = 10)
     
    # Start the GUI 
    gui.mainloop()