gistfile1.py

Python 2.7.3 (default, Apr 10 2012, 23:24:47) [MSC v.1500 64 bit (AMD64)] on win32
Type "copyright", "credits" or "license()" for more information.
==== No Subprocess ====
>>> def factorial(n):
	if n < 1:
		sys.exit
	elif n == 1:
		return 1
	else:
		return n * factorial(n-1)

	
>>> factorial(5)
120
>>> factorial(1)
1
>>> factorial(-1)
>>>