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Python list sort()
  • Difficulty Level : Easy
  • Last Updated : 06 Apr, 2020

The sort function can be used to sort a list in ascending, descending or user defined order.
To sort the list in ascending order.

List_name.sort()
This will sort the given list in ascending order.

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




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




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.

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




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

Sorting user using user defined order.

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




# 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)]

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