Question

Let’s say I have a list of tuples:

a = [(1, 2), (3, 4), (4, 5)]

and another list, no tuples:

b = [1, 2, 3]

How would I use list comprehension to multiply only the first value of each tuple in a by each respective value in b? That is, [a[0][0] * b[0], a[1][0] * b[1], a[2][0] * b[2]]
(Should equal [1, 6, 12])

Answer 1

>>> a = [(1, 2), (3, 4), (4, 5)]
... b = [1, 2, 3]
>>> [x[0]*y for x, y in zip(a, b)]
[1, 6, 12]

The zip function is the key.