Traverse a list in reverse order in Python
Use the built-in reversed() function:
>>> a = ["foo", "bar", "baz"]>>> for i in reversed(a):... print(i)... bazbarfooTo 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 baz1 bar0 fooSince enumerate() returns a generator and generators can't be reversed, you need to convert it to a list first.
It can be done like this:
for i in range(len(collection)-1, -1, -1): print collection[i] # print(collection[i]) for python 3. +So your guess was pretty close :) A little awkward but it's basically saying: start with 1 less than len(collection), keep going until you get to just before -1, by steps of -1.
Fyi, the help function is very useful as it lets you view the docs for something from the Python console, eg:
help(range)