3 kinds of python code for fibonacci

3fibs.py

#!/usr/bin/python2

def fibs1(i):
	fibs=[1,1]
	for j in xrange(2,i):
		fibs.append(fibs[j-1]+fibs[j-2])
	return fibs

def fib2():
	yield (1,1);
	for f in fib2():
		yield (f[1],f[0]+f[1])
def fibs2(i):
	from itertools import islice
	return map(lambda x:x[0],islice(fib2(),0,i))

def fib3(i):
	if i <2: return 1
	return fib3(i-1)+fib3(i-2)
	
def fibs3(i):
	result=[]
	for j in xrange(i):
		result.append(fib3(j))
	return result