Convert list of tuples to list?

Question

How do I convert

[(1,), (2,), (3,)]

to

[1, 2, 3]

Answer 1

>>> a = [(1,), (2,), (3,)]
>>> zip(*a)[0]
(1, 2, 3)

For a list:

>>> list(zip(*a)[0])
[1, 2, 3]