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A thousand times this. Jupyter notebooks are an antipattern. They encourage bad habits and yield copy-pasted, hacked-together, unmaintainable code. The REPL is a tool for exploration, not for full-blown development.

> barring some barriers (e.g. use caching where appropriate)

Fixtures.

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Yes thanks for the vocab. Notebooks are like a single mutable global namespace fixture. Definitely a regression in terms of engineering practice, but Python slow startup and reloading semantics are also barriers, and I’d like to see a nailgun (JVM startup accelerator) for Python someday.

> nailgun (JVM startup accelerator) for Python someday

It's not an exact corollary but pypy sort of fills that niche. Unfortunately, it's two major versions behind and it's not a 100% drop-in replacement.

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