Question

Python write a script that takes a number n as input from the user and calculates the factorial n! (that is n*n-1*n-2*n-3*…*1)

Answer 1

#!/usr/bin/python

import sys

def factorial( n ):
    if( n > 1 ):
        return( n * factorial( n - 1 ) )
    else:
         return( 1 )

if( __name__ == "__main__" ):
    print factorial( int( sys.argv[ 1 ] ) )