Creating New List With Values From Two Prior Lists

Given the lists list1 and list2 that are of the same length, create a new list consisting of the last element of list1 followed by the last element of list2 , followed by the s

Solution 1:

l1 = [1,2,3]
l2 = [4,5,6]

newl = []
for item1, item2 in zip(reversed(l1), reversed(l2)):
    newl.append(item1)
    newl.append(item2)

print newl

Solution 2:

list(sum(zip(list1,list2)[::-1],()))

Solution 3:

Yet another way,

from itertools import izip
l1 = [1, 2, 3, 4]
l2 = [5, 6, 7, 8]
l = []
for _ in izip(reversed(l1), reversed(l2)): l.extend(_)

Solution 4:

May I suggest making your job much simpler by using the list .append() method instead?

>>> mylist = []
>>> mylist.append(1)
>>> mylist
[1]
>>> mylist.append(7)
>>> mylist
[1, 7]

Also another small suggestion, instead of iterating over one list or the other, I'd suggest iterating over numerical indices:

for i in range(len(list1)):

Solution 5:

One-liner:

reduce(lambda x,y: list(x+y), reversed(zip(list1,list2)))

list is necessary as the prior operations return a tuple.