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Jupyter is great for prototyping and playing with ideas, essentially its great it you want persistent data. But after you more or less know what you want and loading the initial dataset isn't a constant annoyance you're usually better off in an IDE or other real programming environment.

I use it to ask a whole bunch of exploratory questions about a dataset then productionize the result in PyCharm (my preference, other ways work great too :)

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This is actually my main problem with the whole idea of these "notebooks". They explicitly encourage exactly the kind of ad hoc coding and practises that plague a lot of scientific work. It's nearly impossible to practise good software engineering while inside one of these things. I know the rationale will be that this is for ad-hoc exploration and the code should be rewritten / redesigned when it's moved into an app, but just like all prototype code that has ever been written, that is not what happens.

I would love something that combines this style with support for good software practices. For example, that let's you seamlessly move snippets of code into functions, classes, modules, and then create tests for them. RStudio is actually the closest I have found, which is ironic since as a language R is horrible for encouraging good software practices.

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