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sort() in Python

  • Difficulty Level : Easy
  • Last Updated : 11 May, 2020

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.

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To sort the list in ascending order.



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.




# 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.




# 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 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)]

Please refer Python Sort articles for more Python Sorting articles.

Thanks to striver for inputs on this topic.




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