Incorrect "if in" statement behaviour? [closed]

I have a set of objects with attribute "coords" (a tuple of two integers) and a method returning this tuple. Additionally, I have a list of tuple coordinates. I want to add the objects whose coords attribute can be found in the list, to a new list.

First I tried this with a simple comprehension:

coords_list = [(0, 0), (0, 1), (0, 2), (1, 0), (1, 1), (1, 2)]
objects_with_matching_coords = [i for i in objects if i.get_coords() in coords_list]

But it seems that get_coords is not satisfying the in condition, even though it does indeed return a tuple of two integers, exactly as in coords_list. The resulting list is empty.

I tried rewriting it as a for loop:

objects_with_matching_coords = []
for obj in objects:
    if obj.get_coords() in coords_list :
        objects_with_matching_coords.append(obj)
    else:
        continue

Same result, objects_with_matching_coords is empty. Does in not treat tuples in a list as items? What's the deal here?