python - get list of tuples first index?

Question

What\'s the most compact way to return the following:

Given a list of tuples, return a list consisting of the tuples first (or second, doesn\'t matter) elements.

Answer 1

>>> tl = [(1,'one'),(2,'two'),(3,'three')]
>>> [item[0] for item in tl]
[1, 2, 3]