Python | Sort all sublists in given list of strings

Last Updated : 31 Dec, 2024

Sorting sublists in a list of strings refers to arranging the elements within each sublist in a specific order. There are multiple ways to sort each list in alphabetical order, let’s understand each one by one.

Using list comprehension

List comprehension with sorted() allows efficient sorting of each sublist in a list of strings. This approach is both simple and optimized for performance, ensuring quick organization of data.

Example:

Python

a = [['Machine', 'London', 'Canada', 'France', 'Lanka'],      ['Spain', 'Munich'],      ['Australia', 'Mandi']]  # Sort each sublist in `a` and store result in 'res' res = [sorted(sublist) for sublist in a] print(res)

Output

[['Canada', 'France', 'Lanka', 'London', 'Machine'], ['Munich', 'Spain'], ['Australia', 'Mandi']]

Let’s explore other methods of sorting all sublists in given list of strings:

Using map()

map() with sorted() applies sorting to each sublist in a list of strings. This approach is efficient and functional, potentially faster for large datasets due to its avoidance of intermediate lists.

Example:

Python

a = [['Machine', 'London', 'Canada', 'France', 'Lanka'],      ['Spain', 'Munich'],      ['Australia', 'Mandi']]  # Sort each sublist using 'map()' and convert to a list res = list(map(sorted, a)) print(res)

Output

[['Canada', 'France', 'Lanka', 'London', 'Machine'], ['Munich', 'Spain'], ['Australia', 'Mandi']]

Using For Loop

For loop method sorts each sublist by manually iterating through the list. It adds the sorted sublists to a new list, making the process more explicit and controlled.

Example:

Python

a = [['Machine', 'London', 'Canada', 'France', 'Lanka'],          ['Spain', 'Munich'],          ['Australia', 'Mandi']] # Sort each sublist for sublist in a :     sublist.sort() # Print the sorted list of sublists print(a)

Output

[['Canada', 'France', 'Lanka', 'London', 'Machine'], ['Munich', 'Spain'], ['Australia', 'Mandi']]

Explanation:

This code sorts each sublist in a alphabetically.
It then prints the updated list of sorted sublists.

How to sort a list of strings in Python

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