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Reactivity is great. Is there any framework for using it without a REPL?

I.e. to define a DAG of tasks and have them executed as needed? I know existing workflow engines, and they are typically not reactive but rather work on batches.

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From a nuts and bolts perspective, I've been thinking of building some reactivity on top of https://github.com/dagworks-inc/hamilton (author here) that could get at this. (If you have a use case that could be documented, I'd appreciate it.)

You probably want rxpy, a port of the reactivex extensions from many other languages to python: https://rxpy.readthedocs.io/en/latest/

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