For loop in an opposite direction

Question

I want to make a for loop in python to go over a list. However, I would like to have it going through the list in the opposite direction. For example

  foo = [1a,2b,3c,4d]
  for number in foo:
      print number

the result of this code should be: 4d 3c 2b 1a and not 1a 2b 3c 4d.

Any elegant way to do this? Or is it best to reorder the initial list itself?

Many thanks for your advice

Answer 1

for number in reversed(foo):
    print number

This has the advantage of not creating a reversed copy of foo; reversed returns a reverse iterator over the list. Also, it works with anything that supports len and indexing with integers.

Answer 2

foo = [1a,2b,3c,4d]
for number in foo[::-1]:
    print number

Answer 3

Just reverse it with slicing notation

print foo[::-1]

Output

['4d', '3c', '2b', '1a']

Or use reversed function,

print "\n".join(reversed(foo))

Output

4d
3c
2b
1a