Katharos - Functional programming and CSP-style concurrency for Python
Show HN: Katharos Functional programming and CSP-style concurrency for Python
Katharos is a Python library that brings functional programming and message-passing concurrency together. It provides algebraic abstractions like Functor, Applicative, Monad, Semigroup, and Monoid, along with concrete types such as Maybe, Result, ImmutableList, and IO. The library models errors, effects, and concurrent communication as composable, type-safe values, eliminating scattered None checks and nested try/except blocks. Its Go-style CSP concurrency uses typed channels and returns Result values, so channel closure is handled as a value, not an exception. With do-notation for monadic code and structured concurrency scopes, Katharos simplifies complex logic and improves code reliability.
A concurrent hand-off returns a Result, so "the channel closed" is something you handle, not an exception you catch.
- h2aichat
Would it help if I tell you could start with the big-picture of what it does and what problem solves and then jump the details? Just an idea!
- kamalf
I've been working on Katharos, a functional programming and concurrency library for Python 3.13+. The idea behind it is simple: absence, errors, effects, and concurrent communication should be explicit, composable values instead of hidden control flow.
- whattheheckheck
Can you focus on mlops and data pipelines at scale as well as locally. I want to incorporate this into PySpark or Ray to be able to have better composition. Also include plugins or something for arbitrary "registers" or extra logging of things like events for observability outside of normal instrumentation like dyantrace