GUI Age Calculator

# importing the tkinter module
from tkinter import *

# importing date class from datetime module
from datetime import date

# initializing tkinter
root = Tk()

# setting the width and height of gui
root.geometry("700x500")

# setting the title of gui
root.title("Age Calculator")

# loading image 
photo = PhotoImage(file="filename.png")

# creating a Label widget to show the image we load
myimage = Label(image=photo)

# placing the image Label widget using grid method
myimage.grid(row=0, column=1)

# defining function to calculate age according to the data given
# by the user 
def calculateAge():
    # storing today's date in "today" variable
    today = date.today()
    # getting birthdate using .get() method
    birthDate = date(int(yearEntry.get()), int(monthEntry.get()), int(dayEntry.get()))
    # calculating age by subtracting birthdate from today's date
    age = today.year - birthDate.year - ((today.month, today.day) < (birthDate.month, birthDate.day))
    # creating a Label widget to show the calculated age using 
    # grid method
    Label(text=f"{nameValue.get()} your age is {age}").grid(row=6, column=1)


# creating a label widget for asking user his/her name
Label(text="Name").grid(row=1, column=0, padx=90)

# creating a label widget for asking user his/her year of birth
Label(text="Year").grid(row=2, column=0)

# creating a label widget for asking user his/her month of birth
Label(text="Month").grid(row=3, column=0)

# creating a label widget for asking user his/her day of birth
Label(text="Day").grid(row=4, column=0)

# declaring a variable of string datatype to store the name value 
# entered by the user
nameValue = StringVar()

# declaring a variable of string datatype to store the year value
# entered by the user
yearValue = StringVar()

# declaring a variable of string datatype to store the month 
# value entered by the user
monthValue = StringVar()

# declaring a variable of string datatype to store the day value
# entered by the user
dayValue = StringVar()

# creating an entry widget to take name value
nameEntry = Entry(root, textvariable=nameValue)

# creating an entry widget to take year value
yearEntry = Entry(root, textvariable=yearValue)

# creating an entry widget to take month value
monthEntry = Entry(root, textvariable=monthValue)

# creating an entry widget to take day value
dayEntry = Entry(root, textvariable=dayValue)

# placing the entry widgets
nameEntry.grid(row=1, column=1, pady=10)
yearEntry.grid(row=2, column=1, pady=10)
monthEntry.grid(row=3, column=1, pady=10)
dayEntry.grid(row=4, column=1, pady=10)

# creating and placing a button to calculate a show age on 
# clicking on this button
Button(text="Calculate age", command=calculateAge).grid(row=5, column=1, pady=10)

# mainloop() is an infinite loop used to run the application when 
# it's in ready state
root.mainloop()