How to get specific elements from list in python

Last Updated : 16 Nov, 2024

In this article, we will learn how to get specific item(s) from given list. There are multiple methods to achieve this. Most simple method is accessing list item by Index.

Python

a = [1, 'geeks', 3, 'for', 5]  # accessing specific list item with their indices item1 = a[1] item3 = a[2] item5 = a[4]  # negative indexing to get last element, same as a[4] item_5 = a[-1]  print(item1, item3, item5, item_5)

Output

geeks 3 5 5

To get multiple items at once through index, you can create a list of indices and iterate to access those items.

Python

a = [1, 'geeks', 3, 'for', 5]  # list of indices index = [1, 2, 4]  for i in index:   print(a[i])    # comprehensive way of writing above for loop # print([a[i] for i in index])

Output

geeks 3 5

Using List Slicing [ to access range of elements]

By using slicing, you can access range of elements by specifying start and end index.

Python

a = [1, 'geeks', 3, 'for', 5]  # Accessing elements from index 1 to 3 (excluding 4) a1 = a[1:4]  # ['geeks', 3, 'for']  # Accessing elements from start to index 3 (excluding 4) a2 = a[:4]  # [1, 'geeks', 3, 'for']  # Accessing elements from index 2 to the end a3 = a[2:]  # [3, 'for', 5]  # Accessing every second element a4 = a[::2]  # [1, 3, 5]  print(a1, a2, a3, a4)

Output

['geeks', 3, 'for'] [1, 'geeks', 3, 'for'] [3, 'for', 5] [1, 3, 5]

Using Slicing is unsuitable if the indices you want are not contiguous or don't follow regular pattern.

Using `itemgetter()` Function [Pythonic and Efficient Approach]

operator.itemgetter function gives better performance as compared to For Loop or comprehension. It can take multiple indices at once and return a tuple.

Python

from operator import itemgetter a = [1, 'geeks', 3, 'for', 5] a1 = itemgetter(1, 3)(a) print(a1)

Output

('geeks', 'for')

Get specific elements from a List (based on condition)

To get the elements based on some condition, you can use List comprehension and filter() method. Let's understand them with help of examples.

Using List Comprehension -

Python

a = [10, 20, 30, 40, 50] # Extract elements greater than 20 a1 = [i for i in a if i > 20] print(a1)

Output

[30, 40, 50]

Using filter() method -

Let's do the same operation as above, using filter() method with lambda function.

Python

a = [10, 20, 30, 40, 50]  # Filter with a lambda function a1 = list(filter(lambda x: x > 20, a))  # [30, 40, 50]  print(a1)

Output

[30, 40, 50]

Python - Slicing List from Kth Element to Last Element

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How to get specific elements from list in python

Using List Slicing [ to access range of elements]

Using itemgetter() Function [Pythonic and Efficient Approach]

Get specific elements from a List (based on condition)

Using List Comprehension -

Using filter() method -

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Using `itemgetter()` Function [Pythonic and Efficient Approach]