Ranking

Sorting and Ranking

How to order DataFrames and Series with sort_values and sort_index, and how to assign competitive ranks to values with the rank method and its tie-breaking str…

How Would You Design a Twitter-Style News Feed?

A Twitter-style news feed is built with a fan-out architecture that precomputes each follower’s timeline on write for most users, falls back to a fan-out-on-re…

How Do You Design a Friend Recommendation System?

A friend recommendation system generates candidates from a user’s social graph (friends-of-friends, mutual connections) using a graph database or precomputed g…