Related Articles

# Python List sort() method

• Difficulty Level : Easy
• Last Updated : 03 Aug, 2021

Python list sort() function can be used to sort a List in ascending, descending, or user-defined order.

### To Sort the List in Ascending Order

Syntax:

List_name.sort()

This will sort the given list in ascending order. This function can be used to sort a list of integers, floating-point numbers, strings, and others.

## Python3

 `numbers ``=` `[``1``, ``3``, ``4``, ``2``]`` ` `# Sorting list of Integers in ascending``numbers.sort()`` ` `print``(numbers)`

Output:

`[1, 2, 3, 4]`

## Python3

 `strs ``=` `[``"geeks"``, ``"code"``, ``"ide"``, ``"practice"``]`` ` `# Sorting list of Integers in ascending``strs.sort()`` ` `print``(strs)`

Output:

`['code', 'geeks', 'ide', 'practice']`

### To Sort the List in Descending Order

Syntax:

list_name.sort(reverse=True)

This will sort the given list in descending order.

## Python3

 `numbers ``=` `[``1``, ``3``, ``4``, ``2``]`` ` `# Sorting list of Integers in descending``numbers.sort(reverse ``=` `True``)`` ` `print``(numbers)`

Output:

`[4, 3, 2, 1]`

### Sorting Using User-defined Order

Syntax:

list_name.sort(key=…, reverse=…) – it sorts according to user’s choice

Parameters:

• reverse: reverse=True will sort the list descending. Default is reverse=False
• key: A function to specify the sorting criteria(s)

## Python

 `# Python program to demonstrate sorting by user's``# choice`` ` `# function to return the second element of the``# two elements passed as the parameter``def` `sortSecond(val):``    ``return` `val[``1``] `` ` `# list1 to demonstrate the use of sorting ``# using using second key ``list1 ``=` `[(``1``, ``2``), (``3``, ``3``), (``1``, ``1``)]`` ` `# sorts the array in ascending according to ``# second element``list1.sort(key ``=` `sortSecond) ``print``(list1)`` ` `# sorts the array in descending according to``# second element``list1.sort(key ``=` `sortSecond, reverse ``=` `True``)``print``(list1)`

Output:

```[(1, 1), (1, 2), (3, 3)]
[(3, 3), (1, 2), (1, 1)]```

Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. And to begin with your Machine Learning Journey, join the Machine Learning – Basic Level Course

My Personal Notes arrow_drop_up