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Showing content from https://www.geeksforgeeks.org/python/python-age-calculator-using-tkinter/ below:

Python: Age Calculator using Tkinter

# import all functions from the tkinter   
from tkinter import *

# import messagebox class from tkinter
from tkinter import messagebox

# Function for clearing the  
# contents of all text entry boxes
def clearAll() :

    # deleting the content from the entry box
    dayField.delete(0, END)
    monthField.delete(0, END)
    yearField.delete(0, END)
    givenDayField.delete(0, END)
    givenMonthField.delete(0, END)
    givenYearField.delete(0, END)
    rsltDayField.delete(0, END)
    rsltMonthField.delete(0, END)
    rsltYearField.delete(0, END)

# function for checking error
def checkError() :

    # if any of the entry field is empty
    # then show an error message and clear 
    # all the entries
    if (dayField.get() == "" or monthField.get() == ""
        or yearField.get() == "" or givenDayField.get() == ""
        or givenMonthField.get() == "" or givenYearField.get() == "") :

        # show the error message
        messagebox.showerror("Input Error")

        # clearAll function calling
        clearAll()
        
        return -1

# function to calculate Age 
def calculateAge() :

    # check for error
    value = checkError()

    # if error is occur then return
    if value ==  -1 :
        return
    
    else :
        
        # take a value from the respective entry boxes
        # get method returns current text as string
        birth_day = int(dayField.get())
        birth_month = int(monthField.get())
        birth_year = int(yearField.get())

        given_day = int(givenDayField.get())
        given_month = int(givenMonthField.get())
        given_year = int(givenYearField.get())
        
        
        # if birth date is greater then given birth_month 
        # then donot count this month and add 30 to the date so 
        # as to subtract the date and get the remaining days 
        month =[31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
        
        if (birth_day > given_day):
            given_month = given_month - 1
            given_day = given_day + month[birth_month-1] 
                    
                    
        # if birth month exceeds given month, then 
        # donot count this year and add 12 to the 
        # month so that we can subtract and find out 
        # the difference 
        if (birth_month > given_month):
            given_year = given_year - 1
            given_month = given_month + 12
                    
        # calculate day, month, year 
        calculated_day = given_day - birth_day; 
        calculated_month = given_month - birth_month; 
        calculated_year = given_year - birth_year;

        # calculated day, month, year write back
        # to the respective entry boxes

        # insert method inserting the  
        # value in the text entry box.
        
        rsltDayField.insert(10, str(calculated_day))
        rsltMonthField.insert(10, str(calculated_month))
        rsltYearField.insert(10, str(calculated_year))
    

# 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("Age Calculator")

     # Set the configuration of GUI window
    gui.geometry("525x260")

    # Create a Date Of Birth : label 
    dob = Label(gui, text = "Date Of Birth", bg = "blue")

    # Create a Given Date : label
    givenDate = Label(gui, text = "Given Date", bg = "blue")

    # Create a Day : label
    day = Label(gui, text = "Day", bg = "light green")

    # Create a Month : label
    month = Label(gui, text = "Month", bg = "light green")

    # Create a Year : label
    year = Label(gui, text = "Year", bg = "light green")

    # Create a Given Day : label
    givenDay = Label(gui, text = "Given Day", bg = "light green")

    # Create a Given Month : label
    givenMonth = Label(gui, text = "Given Month", bg = "light green")

    # Create a Given Year : label
    givenYear = Label(gui, text = "Given Year", bg = "light green")

    # Create a Years : label
    rsltYear = Label(gui, text = "Years", bg = "light green")

    # Create a Months : label
    rsltMonth = Label(gui, text = "Months", bg = "light green")

    # Create a Days : label
    rsltDay = Label(gui, text = "Days", bg = "light green")

    # Create a Resultant Age Button and attached to calculateAge function
    resultantAge = Button(gui, text = "Resultant Age", fg = "Black", bg = "Red", command = calculateAge)

    # Create a Clear All Button and attached to clearAll function
    clearAllEntry = Button(gui, text = "Clear All", fg = "Black", bg = "Red", command = clearAll)

    # Create a text entry box for filling or typing the information.  
    dayField = Entry(gui)
    monthField = Entry(gui)
    yearField = Entry(gui)
    
    givenDayField = Entry(gui)
    givenMonthField = Entry(gui)
    givenYearField = Entry(gui)
    
    rsltYearField = Entry(gui)
    rsltMonthField = Entry(gui)
    rsltDayField = Entry(gui)


    # grid method is used for placing  
    # the widgets at respective positions  
    # in table like structure .
    dob.grid(row = 0, column = 1)
    
    day.grid(row = 1, column = 0)
    dayField.grid(row = 1, column = 1)
    
    month.grid(row = 2, column = 0)
    monthField.grid(row = 2, column = 1)
    
    year.grid(row = 3, column = 0)
    yearField.grid(row = 3, column = 1)
    
    givenDate.grid(row = 0, column = 4)
    
    givenDay.grid(row = 1, column = 3)
    givenDayField.grid(row = 1, column = 4)
    
    givenMonth.grid(row = 2, column = 3)
    givenMonthField.grid(row = 2, column = 4)
    
    givenYear.grid(row = 3, column = 3)
    givenYearField.grid(row = 3, column = 4)
    
    resultantAge.grid(row = 4, column = 2)
    
    rsltYear.grid(row = 5, column = 2)
    rsltYearField.grid(row = 6, column = 2)
    
    rsltMonth.grid(row = 7, column = 2)
    rsltMonthField.grid(row = 8, column = 2)
    
    rsltDay.grid(row = 9, column = 2)
    rsltDayField.grid(row = 10, column = 2)

    clearAllEntry.grid(row = 12, column = 2)

    # Start the GUI
    gui.mainloop()    

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