I downloaded Sage a few years ago, when I was getting into algebraic number theory. That was my first experience with Python, notebooks, numpy/scipy etc. Now I

I downloaded Sage a few years ago, when I was getting into algebraic number theory. That was my first experience with Python, notebooks, numpy/scipy etc. Now I do almost all my programming - which is mostly maths-related graphics and image manipulation/processing, but all kinds of stuff - with Sage, in Cython. Usually with the CLI (and a text editor), occasionally with the notebook (to run individual lines and for the better error messages). I love being able to choose the C or Python way to do something. I can quickly get from initial idea to working program, and it runs fast. It's just a pleasure to use. Thank you williamstein!!