As someone who often works with Python scripts, Jupyter Notebook is my favorite tool for making notes during lectures and sharing my painstakingly-written code with my programming friends and rivals.

Originally developed for data science applications written in Python ... in a Jupyter Notebook can be run all at once or incrementally. When a code cell is in focus, click the “Run” button ...

IDG. A Jupyter Notebook with text, code, and a visualization. Altering the code and re-running it live in the browser will change the output, and the new results can be saved to a new notebook.