Every subscription starts with a free trial. A trial converts if the subscriber didn't cancel before the trial ended: either they never cancelled, or they cancelled after trial_ends_on.
From subscriptions.csv, store the conversion rate per plan, rounded to 3 decimals, as a Series.
Expected answer
Store your answer in result.
Hints, the later steps and the answer come with Pro.
import pandas as pd
subs = pd.read_csv("subscriptions.csv", parse_dates=["started_on", "trial_ends_on", "cancelled_on"])
result = ...