Extract first item of each sublist

I am wondering what is the best way to extract the first item of each sublist in a list of lists and append it to a new list. So if I have:

    lst = [[a,b,c], [1,2,3], [x,y,z]]

and I want to pull out a, 1 and x and create a separate list from those.

I tried:

    lst2.append(x[0] for x in lst)

Using list comprehension:

    >>> lst = [['a','b','c'], [1,2,3], ['x','y','z']]
    >>> lst2 = [item[0] for item in lst]
    >>> lst2
    ['a', 1, 'x']

From: stackoverflow.com/q/25050311