Python GUI Find Factorial by Recursive Function

# Python GUI program Find Factorial 
# of a Number by Recursion
# Input a number and show its factorial
# using a user defined recursive factorial function
# www.EasyCodeBook.com


from tkinter import *

def inputn():
	n= int(entry.get())
	# call recursive_factorial function
	fact= recursive_factorial(n)
	str1 = "Factorial of " + str(n) + " is " + str(fact)
	output_label.configure(text = str1, justify=LEFT)
    
def recursive_factorial(n):
	
    #  We know that Base case is factorial of 0 is 1
    #  or 0! = 1
    if n == 0:
        return 1

    # We also Know that Recursive case is : n! = n * (n-1)!
    else:
        return n * recursive_factorial(n-1)
	
	
	
main_window = Tk()
main_window.title("Perfect Python tkinter Tutorials : www.EasyCodeBook.com")
message_label = Label(text= ' Enter a number to \ncalculate its Factorial ' ,
font=( ' Verdana ' , 12))
output_label = Label(font=( ' Verdana ' , 12))
entry = Entry(font=( ' Verdana ' , 12), width=6)

calc_button = Button(text= ' Calculate Factorial ' , font=( ' Verdana ', 12), 
	command=inputn)


message_label.grid(row=0, column=0,padx=10, pady=10)
entry.grid(row=0, column=1,padx=10, pady=10, ipady=10)
calc_button.grid(row=0, column=2,padx=10, pady=10)
output_label.grid(row=1, column=0, columnspan=3,padx=10, pady=10)


mainloop()

You would also like Python GUI Programs using tkinter Module:

1. Python GUI Temperature Conversion Program Celsius to Fahrenhiet
2. Python GUI Program Temperature Conversion Fahrenheit to Celsius
3. Python Pounds to Kilogram Converter GUI tkinter Program
4. Python 3 Four Function Calculator Program tkinter GUI
5. Python Digital Clock Program using tkinter GUI
6. Python Quotes Changer Program tkinter GUI
7. Python 3 tkinter Spinbox GUI Program Example
8. Python 3 tkinter Message Widget Program Examples
9. Python 3 GUI Program tkinter Radio Buttons
10. Adding Menus to Python 3 tkinter GUI Programs
11. Python 3 GUI Program Add Two Numbers
12. Python 3 GUI Miles to Kilometers Converter tkinter Program
13. Python 3 tkinter GUI Kilogram to Pounds Program
14. Python Set Label Text on Button Click tkinter GUI Program
15. Show Label and Button Widgets Python Tkinter Program
16. Python GUI Program Area of Triangle with base and height
17. Python 3 Tkinter GUI Hello World Program
18. Create and Show Root Window of tkinter GUI Program
19. Find Factorial of Number by Recursion Python GUI Program
20. Multiplication Table Python GUI Program