Traverse a list in reverse order in Python

How do I traverse a list in reverse order in Python? So I can start from collection[len(collection)-1] and end in collection[0].

I also want to be able to access the loop index.

Use the built-in reversed() function:

>>> a = ["foo", "bar", "baz"]
>>> for i in reversed(a):
...     print(i)
... 
baz
bar
foo

To also access the original index, use enumerate() on your list before passing it to reversed():

>>> for i, e in reversed(list(enumerate(a))):
...     print(i, e)
... 
2 baz
1 bar
0 foo

Since enumerate() returns a generator and generators can't be reversed, you need to convert it to a list first.

Stack Overflow Q#529424, score: 1824