'for' loop explanation request

I recently started learning python. So I wrote some small code, this code asks for 2 sizes of lists, creates 2 lists with random integers from 0-9 and then spits out the intersection between two lists.

The last "for" loop - I had trouble with it because at first my "intersection" list had repetitions, then I looked up for an answer and got what I have now, it works, however I don't know why. My problem is grasping how "for i in l1 and in l2" works? I know that "for i in range(k)" is going through the numbers 0-k but this strange for loop with the "and" operator just puzzles me.

l1 = []
l2 = []
C = []
s1 = int(input("Your 1st list size->"))
s2 = int(input("Your 2nd list size->"))
for i in range(s1):
    from random import randint
    k = (randint(0,9))
print("First List ->" , l1)
for i in range(s2):
    from random import randint
    k = (randint(0,9))
print("Second List ->" , l2)
for i in l1 and l2:
    if i in l1 and l2:

print("Intersection ->" , C)

Please let me know if there is another place to submit such questions(if here is not for suitable).

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