This is a basic Python program which helps school and college students to improve their knowledge in Python.
If you don’t know what is factorial, here is a small explanation,
Multiplying given integer with the sequence of descending positive integers is called factorial. For example,
5! is 5 x 4 x 3 x 2 x 1 = 120
So the value of 5! is 120
We can also find the values in the reverse way ie.,
5! is 1 x 2 x 3 x 4 x 5 = 120
In this program we are going to follow the above second method to find the value of the n! (n factorial)
Now, lets see the Python Factorial Program here:
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print ("Enter Number to calculate Factorial: ") #get the input n = int(input()) fact = 1 print ("Factorial of", n, "is:") #loop range from 1 to n for i in range(1, n + 1): fact = fact * i print (fact) |
This code works in both the Python 2 and Python 3 versions.
Let’s see the CGI version aka Python web version of this program:
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#!/usr/bin/python print "Content-type: text/html\n\n"; # Import modules for CGI handling import cgi, cgitb print ''' <html> <head><title>Python CGI program to find n! (n factorial)</title></head> <body> <h3>Web Based Factorial Python script to find n! - <a href="http://www.tutorialsmade.com/">Tutorialsmade.com</a></h3> <form action="" method="post"> <label>Enter Number to calculate Factorial:<label> <input type="text" name="n" /> <input type="submit" value="Submit" /> </form><br /><br /> </body> </html> ''' # Create instance of FieldStorage form = cgi.FieldStorage() #get the input n = form.getvalue('n') if(n): #type case string to int n = int(n) fact = 1 print "Factorial of", n, "is:", "<br>" #loop range from 1 to n for i in range(1, n + 1): fact = fact * i print fact,"<br>" |
It’s same as the normal Python application program but the only difference is the extra Form added in this script.
Here is the demo of the above script:
