Each row of ad_events.csv is one impression, click or checkout for an ad campaign. The ads team ranks campaigns by click-through rate (CTR): clicks divided by impressions.
Store the 5 campaigns with the highest CTR, with columns campaign_id, impressions, clicks and ctr (rounded to 3 decimals), highest CTR first.
Expected answer
Store your answer in result.
Hints, the later steps and the answer come with Pro.
import pandas as pd
events = pd.read_csv("ad_events.csv")
result = ...