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Python | Merge first and last elements separately in a list
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Get first and last elements of a list in Python

Last Updated : 21 Feb, 2025
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The task of getting the first and last elements of a list in Python involves retrieving the initial and final values from a given list. For example, given a list [1, 5, 6, 7, 4], the first element is 1 and the last element is 4, resulting in [1, 4].

Using indexing

This is the most straightforward way to get the first and last elements. We can access the first element with a[0] and the last element with a[-1]. It is quick and easy to understand, making it the most commonly used approach.

Python 
a = [1, 5, 6, 7, 4]  res = [a[0], a[-1]] print(res)

Output
[1, 4]

Explanation:[a[0], a[-1]] creates a new list res containing the first element of a (accessed by a[0]) and the last element of a (accessed by a[-1]).

Table of Content

  • Using unpacking
  • Using list comprehension
  • Using operator.itemgetter

Using unpacking

Unpacking allows us to extract the first and last elements while ignoring the rest. Using first, *_, last = a gives the first and last elements directly. It is cleaner when we only care about the ends and don’t need the elements in between.

Python 
a = [1, 5, 6, 7, 4]  first, *_, last = a  res = [first, last] print(res)

Output
[1, 4]

Explanation: first, *_, last = a assigns the first element (1) to first, the last element (4) to last, and the middle elements [5, 6, 7] to _, which is ignored as _ is a placeholder for unused values. Then, res = [first, last] creates a new list [1, 4].

Using list comprehension

List comprehension can be used to pick specific positions from a list. You can get the first and last elements using [a[i] for i in (0, -1)]. This method works well but is less readable compared to indexing.

Python 
a = [1, 5, 6, 7, 4]  res = [a[i] for i in (0, -1)] print(res)

Output
[1, 4]

Explanation:[a[i] for i in (0, -1)] create a new list by accessing a[0] (first element 1) and a[-1] (last element 4), resulting in [1, 4], which is stored in res.

Using operator.itemgetter

itemgetter() function from the operator module fetches elements by index. We can get the first and last elements using itemgetter(0, -1)(a). It is useful when we need multiple elements by position, but less common for just two values.

Python 
from operator import itemgetter  a = [1, 5, 6, 7, 4]  getter = itemgetter(0, -1) res = list(getter(a)) print(res)

Output
[1, 4]

Explanation: itemgetter(0, -1) creates a getter function to fetch the first (a[0] → 1) and last (a[-1] → 4) elements from a. getter(a) extracts these values and list() converts them into [1, 4], stored in res.



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Python | Merge first and last elements separately in a list
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manjeet_04
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Article Tags :
  • Python
  • Python Programs
  • Python list-programs
Practice Tags :
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