How to Extract the First Element from Each Sublist in a Python List?

Extracting First Items of Sublists in Python

Given a list of lists, a common task is to extract the first item from each sublist and create a new list with these items.

Using List Comprehension

One efficient way to achieve this is through list comprehension:

lst2 = [item[0] for item in lst]

For example:

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

Using the list comprehension, we can extract the first items:

lst2 = [item[0] for item in lst]

Result:

['a', 1, 'x']

This approach creates a new list, lst2, containing the first items of each sublist in lst.

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