الضرب النقطي والتشابه

quantities = [2, 1, 3]        # milk, bread, eggs (packs)
prices = [45, 10, 90]         # price of each

bill = sum(q * p for q, p in zip(quantities, prices))
print("Total bill:", bill, "EGP")

import math

def dot(a, b):
    return sum(x * y for x, y in zip(a, b))

def norm(v):
    return math.sqrt(dot(v, v))

def cosine(a, b):
    return dot(a, b) / (norm(a) * norm(b))

#         action, comedy, romance
ahmed = [5, 1, 2]
sara = [4, 2, 1]
omar = [1, 5, 5]

print("Ahmed vs Sara:", round(cosine(ahmed, sara), 2))
print("Ahmed vs Omar:", round(cosine(ahmed, omar), 2))