如何比较两个二维列表中的元素？

Question

So for example I have two lists like this and I want to compare the lists inside the two list

a = [[1,2],[3,4],[4,5]]

b = [[1,2],[4,5],[5,6]]

if [1,2] = [1,2] then it should append to another list(also for [4,5]) The point is I can't think of how to get the [4,5] into the new list

and [3,4] and [5,6] should not be appended

Here is the actual problem I am solving

So each list has 4 elements and it will have another column for classification I have 2 datasets and I want to compare the coordinates in order to map the Name of the first table to the Name of the second table

Answer 1

You can do so with list comprehension

a = [[1,2],[3,4],[4,5]] 
b = [[1,2],[4,5],[5,6]]

print([e for e in a if e in b])

>>> [[1, 2], [4, 5]]