#!/usr/bin/python

def proof():
	"""
	>>> proof()
	4
	"""
	l = (1,2,3) # here I defined the list, but it could be generated from something else
	# if it is complicated, I would like to debug it and print its value
	print l
	# this will raise and exception, and I will not be able to see why, because doctest won't print l
	return l[3]

if __name__ == "__main__":
	import doctest
	doctest.testmod()