PyCharm - Python & Django IDE with intelligent code completion, on-the-fly error checking, quick-fixes, and much more...
Observable - Interactive code examples/posts
IDLE - Default IDE which come installed with the Python programming language.
nbviewer.org - Rackspace server host Jupyter Notebooks from your github repo
Thonny - Python IDE for beginners
Jupyter - Project Jupyter exists to develop open-source software, open-standards, and services for interactive computing across dozens of programming languages. Ready to get started? Try it in your browser Install the Notebook.