konrad konrad - 2 years ago 151
Python Question

Extract first item of each sublist in python

I am wondering what is the best way to extract a 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 seperate list from those.

I tried:

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

Answer Source

Using list comprehension:

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