Fig 1. A new Python 3 notebook with 3 empty cells denoted by the grey rectangles.
The currently selected cell is highlighted in green.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.