I want a simple, convenient default in std thread and process pool like in Python.
Have you seen the rayon crate?
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Rust tries to keep the standard library small. There are plenty of thread pool crates to choose from on crates.io, (or use https://lib.rs if you want better search).
It's typical in Rust to use dependencies even for basic things that Python has in the standard library. Batteries are not included in Rust.
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