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# Python List | sort method

schedule Aug 12, 2023
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Python
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Python's `list.sort(~)` method sorts the elements of a list. The list is sorted in ascending order by default.

NOTE

`list.sort(~)` changes the order of the list permanently.

# Parameters

1. `reverse` | `boolean` | `optional`

If `True`, the sorted list is reversed (sorted in descending order). Defaults to `False`.

2. `key` | `function` | `optional`

A function to specify the sorting criteria. The function should take a single argument and return a key to use for sorting purposes. Defaults to `None`.

`None`

# Examples

## Basic usage

To sort the list `animals` in ascending order:

``` animals = ['cat', 'doge', 'bird']animals.sort()print(animals) ['bird', 'cat', 'doge'] ```

Note that the list is now sorted with elements in ascending alphabetical order.

## Reverse parameter

To sort the list `animals` in descending order:

``` animals = ['cat', 'doge', 'bird']animals.sort(reverse = True)print(animals) ['doge', 'cat', 'bird'] ```

Note that the list is now sorted with elements in descending alphabetical order.

## Key parameter

To sort the list `numbers` according to the remainder when dividing each element by 3:

``` # A function that returns the remainder when dividing each element by 3def modulo_3(elem): return(elem % 3)numbers = [5, 3, 4, 2]# Sort numbers list using modulo_3 function as sorting keynumbers.sort(key = modulo_3)print(numbers) [3, 4, 5, 2] ```

Note that `numbers` list is now sorted in ascending order according to the remainder when each element is divided by 3.

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Official Python Documentation
https://docs.python.org/3/howto/sorting.html
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