Find difference between two 2D array in python [duplicate]

Question

How do I find the difference between two 2D array in python ?

First array and second array

arr1 = [[1,1],[1,2],[1,3],[1,4],[1,5]]
arr2 = [[1,2],[1,3],[1,4]]

The result I want

result = [[1,1],[1,5]]

Answer 1

You can first convert all element to tuple then use set and difference like below:

>>> set(map(tuple,arr1)).difference(map(tuple,arr2))
{(1, 1), (1, 5)}

>>> list(map(list , set(map(tuple,arr1)).difference(map(tuple,arr2))))
[[1,1],[1,5]]