How to remove items from a list A that present in list B (with the removal of duplicates )

Question

Implement a difference function, which subtracts one list from another and returns the result.

It should remove all values from list a, which are present in list b.

for example :-

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

b = [7,9,3]

the result should be [1,2,4]

Answer 1

One way to get the result is to use list comprehension:

a = [1,2,3,3,4]
b = [7,9,3]

c = [x for x in a if not x in b]

print(c)

Answer 2

Simple list comprehension will solve it to you:

a = [1,2,3,3,4]
b = [7,9,4]
print([item for item in a if item not in b])

output:

[1, 2, 3, 3]