title: Python - import csv file and group numbers by column
body: <p>My problem is simple: I have <a href="https://gofile.io/d/O6e9wS" rel="nofollow noreferrer">this</a> csv file.
  I use Python 3. This file represent the number of new covid cases divided by country every day. But what I want to do is to obtain the global number of cases day by day regardless of the origin country. What is the fastest and simplest way to do this ?</p>
  <p>Thank you</p>