Python: Sort List

It sorts the elements of a given list in a specific ascending or descending order.

1. Sort list in ascending order

Syntax:

List_name.sort()

Example: 

list_1 = [6,4,5,2,3,1]
list_1.sort()
print(list_1)

Output: [1, 2, 3, 4, 5]

2. Sort list in descending order

Syntax:

list_name.sort(reverse = True)

Example: 

list_1 = [6,4,5,2,3,1]
list_1.sort(reverse = True)
print(list_1)

Output: [6, 5, 4, 3, 2, 1]

3. Sort list using user defined order

It sorts according to user's choice.

Syntax:

list_name.sort(key=…, reverse=…)

Example: 

def sort_first(val):
    return val[1]

list_1 = [(1, 2), (3, 3), (1, 1)]
list_1.sort(key = sort_first) 
print(list_1)

Output: [(1, 1), (1, 2), (3, 3)]