Serox

Rusty abstractions for Python.

Serox defines a emulates a suite of commonly-used Rust abstractions in a manner that is near-fully static-type-checker compliant, the exceptions being cases involving higher-kinded types (HKTs; e.g. Iterator.collect) as these are not currently supported by Python's type system. Namely:

1. Iterator combinators that allow for the seamless chaining of operations over data with rayon-inspired functionality for effortless parallelism.

2. A Result pseudo-enum comprising Some and Null pseudo-variants. We say 'pseudo' as the Python analogue to Rust's tagged union is the union (A | B) type; since this type is not a data structure, we cannot implement methods on it directly and instead have to resort to some legerdemain.

3. An Option pseudo-enum. The T | None pattern is ubiquitous in Python yet, frustratingly, is not treated as a first-class citizen within the language; Option is a drop-in replacement that redresses this.

4. The qmark decorator emulates the '?' (error/null short-circuiting) operator, allowing for propagation of error and null values without interrupting the control flow. Without this, one has to resort to awkward pattern-matching to perform common operations such as unwrap_or (setting Null to a default value) or map (applying a function to the contained value if Some).

from serox import Option, qmark

@qmark
def some_function(foo: Option[str]) -> Option[str]:
    foo_bar: str = value.map(lambda x: x + "bar").q
    return Some(foo_bar + "_baz")

Acknowledgements

Credit to result and rustshed for laying the groundwork for the Result and qmark implementations.