Python - sequencia de fibonacci - melhore este código, comente

	#!/usr/bin/env python
	# # -*- coding: UTF-8 -*-
	# Criado em:Qui 11/Mar/2010 hs 08:19
	# Last Change: Qui 11 Mar 2010 08:52:48 BRT
	# vim:ft=python:nolist:nu:
	# Instituicao: none
	# Proposito do script: calcular sequencia de fibonacci
	# Autor: Sérgio Luiz Araújo Silva
	# site: http://vivaotux.blogspot.com
	"""
	importe: from fibonacci import fib
	g = fib
	for i in range(max):
	print g.next(),
	"""
	from __future__ import generators
	import os
	# limpando a tela
	if os.name == 'posix':
	os.system('clear')
	else:
	os.system('cls')
	# needs Python 2.2 or above!
	def fib():
	"unbounded generator, creates Fibonacci sequence"
	x,y=0,1
	while 1:
	x, y = y, x + y
	yield x
	if __name__ == "__main__":
	g = fib()
	max = int(raw_input("Digite o numero a calcular: "))
	for i in range(max):
	print g.next(),
	# O Magnun Leno http://www.blogger.com/profile/04716536861057964759
	# enviou uma versão com recursividade:
	#def fib(max, x=0, y=1):
	# next = x + y
	# if next >= max:
	# print x,y
	# return
	# print x,
	# fib(max, y, next)
	#
	## Para executar:
	#>>> fib(10)
	#0 1 1 2 3 5 8

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