Question

I’m wondering if someone could help guide the approach to this fairly common problem:

I’m building a simple site which a user connects their twitter account to sign up. I’d like to create an interface which shows them which of their twitter friends are already using the site.

So I can get a list the user’s twitter friends, and a list of the site’s users (which all have the twitter screen name as username, but I’m wondering the most efficient method to compare these lists and create a variable with the commonalities.

As an aside, given the Twitter API returns IDs, should I save the twitter user’s ID (in addition to their username) when they create an account?

Thanks in advance!

Answer 1

Create Sets out of them, and use the intersection method:

intersection_set = set(list_a).intersection(list_b)