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# sort() in Python

• Difficulty Level : Easy
• Last Updated : 24 May, 2022

Like C++ sort(), Java sort() and other languages, python also provides built in function to sort. The sort function can be used to sort the list in both ascending and descending order. To sort the list in ascending order. Its time complexity is O(NlogN).

Syntax

# This will sort the given list in ascending order. # It returns a sorted list according to the passed parameter. List_name.sort()

This function can be used to sort list of integers, floating point number, string and others.

## Python3

 `# List of Integers``numbers ``=` `[``1``, ``3``, ``4``, ``2``]` `# Sorting list of Integers``numbers.sort()` `print``(numbers)` `# List of Floating point numbers``decimalnumber ``=` `[``2.01``, ``2.00``, ``3.67``, ``3.28``, ``1.68``]` `# Sorting list of Floating point numbers``decimalnumber.sort()` `print``(decimalnumber)` `# List of strings``words ``=` `["Geeks", "For", "Geeks"]` `# Sorting list of strings``words.sort()` `print``(words)`

Output:

```[1, 2, 3, 4]
[1.68, 2.0, 2.01, 3.28, 3.67]
['For', 'Geeks', 'Geeks']```

To sort the list in descending order.

Syntax

```list_name.sort(reverse=True)
This will sort the given list in descending order.```

## Python3

 `# List of Integers``numbers ``=` `[``1``, ``3``, ``4``, ``2``]` `# Sorting list of Integers``numbers.sort(reverse``=``True``)` `print``(numbers)` `# List of Floating point numbers``decimalnumber ``=` `[``2.01``, ``2.00``, ``3.67``, ``3.28``, ``1.68``]` `# Sorting list of Floating point numbers``decimalnumber.sort(reverse``=``True``)` `print``(decimalnumber)` `# List of strings``words ``=` `["Geeks", "For", "Geeks"]` `# Sorting list of strings``words.sort(reverse``=``True``)` `print``(words)`

Output:

```[4, 3, 2, 1]
[3.67, 3.28, 2.01, 2.0, 1.68]
['Geeks', 'Geeks', 'For']```

Syntax :

list_name.sort() – it sorts in ascending order list_name.sort(reverse=True) – it sorts in descending order list_name.sort(key=…, reverse=…) – it sorts according to user’s choice

Parameters: By default, sort() doesn’t require any extra parameters. However, it has two optional parameters:

reverse – If true, the list is sorted in descending order key – function that serves as a key for the sort comparison

## 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 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)]```

Please refer Python Sort articles for more Python Sorting articles. Thanks to striver for inputs on this topic.

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