data-science-from-scratch

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I think that:

def most_common_interests_with(user_id): return Counter(interested_user_id for interest in interests_by_user_id["user_id"] for interested_user_id in user_ids_by_interest[interest] if interested_user_id != user_id)

Should be:

def most_common_interests_with(user_id): return Counter(interested_user_id for interest in interests_by_user_id[user_id] for interested_user_id in user_ids_by_interest[interest] if interested_user_id != user_id)

Quotes around user_id in third quoted line removed.

Agree, the former assumes integers are subscriptable @snooze good catch!