I totally get your point, but that's still below the level of abstraction I'm talking about. Basically it boils down to, python's main trick is metaprogramming. If your interprocess optimization is a bottleneck, then write a framework which lets you put those pieces together under the hood.

> Furthermore, Julia has much power powerful metaprogramming facilities than Python does.

Until someone writes a way to import julia code directly into python/autogenerate it from python. Anyone who says "well then you're not really writing python" is missing the whole point: writing python is all about exactly this sort of tip-of-the-abstraction-iceberg trickery.

Sure, you can call python from Julia as well. So it boils down to "which is the better glue language?" This isn't a competitive thing, it's just literally what Python is meant to do.

https://pyjulia.readthedocs.io/en/latest/usage.html