Also, check out https://orgmode.org/worg/org-contrib/babel/languages/ob-doc-python.html#org3fa29ea

Even better is using paper cards - one idea per card; can arrange in front of you or pin onto a board. Like https://www.lesswrong.com/posts/NfdHG6oHBJ8Qxc26s/the-zettelkasten-method-1#Zettelkasten__Part_2__Further_Advice (ignore Zettelkasten part - look at the image)

(setq org-agenda-files (list "~/org/)) has a missing closing ".