Question

Write code to complete print_factorial()'s recursive case. sample output if user_val is 5: 5! = 5 * 4 * 3 * 2 * 1 = 120

Answer 1

```
#!/usr/local/bin/python3


import sys

def print_factorial( user_val ):
    if( user_val < 1 ):
        return( 1 )
    else:
        return( print_factorial( user_val - 1 ) * user_val )


if( __name__ == "__main__" ):
    if( len( sys.argv ) == 2 ):
        print( print_factorial( int ( sys.argv[ 1 ] ) ) )
    else:
        sys.stderr.write( "usage: %s <integer>\n" % sys.argv[ 0 ] )

    exit( 0 )
```