How do u return a list that contains elements that are similar in both list

Question

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

Answer 1

As an alternative to the provided solution from NotAPythonNinja you could use:

c = list(set(a) & set(b))

Answer 2

2 perfect answers are already show, but i want to add a for loop. May be it helps for better understanding.

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

for num in a:
if num in b:
c.append(num)
print(c)