What is Altair? Why its declarative nature makes code concise and readable, and when to use it

IntroductionWhen drawing graphs in Python, it is common to use a step-by-step approach: setting axes, adjusting legends, ...
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I had accumulated 4,000 generated images and could no longer find anything.

I open the folder. I scroll through the thumbnails. I don't know where 'that cat, the one on the veranda' is. I can't track it by date or filename. In the end, I just recreate it with the same prompt ...