Python – Filter Sorted Rows

When it is required to filter sorted rows, a list comprehension and the ‘sorted’ and ‘list’ methods are used.

Below is a demonstration of the same −

Example

my_list = [[99, 6, 75, 10], [1, 75, 2, 4, 99], [75, 15, 99, 2], [1, 4, 15, 99]]

print("The list is :")
print(my_list)

my_result = [sub for sub in my_list if sub == list(sorted(sub)) or sub == list(sorted(sub, reverse=True))]

print("The resultant list is :")
print(my_result)

Output

The list is :
[[99, 6, 75, 10], [1, 75, 2, 4, 99], [75, 15, 99, 2], [1, 4, 15, 99]]
The resultant list is :
[[1, 4, 15, 99]]

Explanation

• A list of list is defined and is displayed on the console.

• A list comprehension is used to iterate over the elements and check if the sorted elements is equal to the original list or reversed sorted list

• If yes, it is converted to a list, and assigned to a variable.

• This is displayed as output on the console.