Delete intersection between two lists

Question

I have two lists of objects:

m2m_links = mymodel._meta.many_to_many
o2m_links = mymodel._meta.get_all_related_objects()

There is an object

Answer 1

to remove the intersection between two list you should use set

a = set(range(10))
b = set(range(5,15))
a-b
>>set([0, 1, 2, 3, 4])
b-a
>>set([10, 11, 12, 13, 14])