How to multiply python string and integer arrays

Question

I have two different lists which I would like to combine

a = ['A', 'B', 'C']

b = [2, 10, 120]

So the desired output should be like this:

ab = ['A2', 'B10', 'C120']

I've tried this:

ab = [a[i]*b[i] for i in range(len(a))]

But I now understand that this will only work if I want to multiply two array of integers. So what should I do in order to get the desired output as above?

Thank you.

Answer 1

The same idea as To Click's, but a little different, you can type cast after unpacking the items

>>> [str(y)+str(x) for y,x in zip(a, b)]
['A2', 'B10', 'C120']

Answer 2

You could use zip() to do this:

>>> zip(a, [str(i) for i in b])
[('A', '2'), ('B', '10'), ('C', '120')]

As such:

>>> a = ['A', 'B', 'C']
>>> 
>>> b = [2, 10, 120]
>>> [y + z for (y, z) in zip(a, [str(i) for i in b])]
['A2', 'B10', 'C120']
>>> 

In this example, we are first converting each integer in b to a string, so that we can do string concatenation, then we zip a and b together, so that we can easily loop over the new list using another list comprehension and string concatenation to get the desired result.