python - Pythonic way to insert every 2 elements in a string

Question

Is there a pythonic way to insert an element into every 2nd element in a string?

I have a string: 'aabbccdd' and I want the end result to be 'aa-bb-cc-dd'.

I am not sure how I would go about doing that.

Answer 1

>>> s = 'aabbccdd'
>>> '-'.join(s[i:i+2] for i in range(0, len(s), 2))
'aa-bb-cc-dd'