Katharos: Monads, functors, and immutable data for Python
Katharos is a library that introduces functional programming concepts to Python, including monads, functors, and immutable data structures. It allows for type-safe code and provides tools for handling optional values and modeling errors as values. The library is available for installation via pip and includes comprehensive documentation for users.
- ▪Katharos provides functional programming abstractions for Python, such as Monads and Functors.
- ▪Users can handle optional values without None checks using the Maybe type.
- ▪The library allows for chaining operations with do-notation and combining values with the Semigroup operator.
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| Original publisher | GitHub |
| Canonical URL | https://github.com/kamalfarahani/katharos |
| Publication time | Wed, 27 May 2026 15:27:22 +0000 |
| Retrieval time | 2026-05-27T15:38:01.782Z |
| Last seen | 2026-05-27T15:38:01.782Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
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| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | VNDD_x26-n9e |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
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| Publisher visit | Yes — open original |
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| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
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Opening excerpt (first ~120 words) tap to expand
Katharos Functional programming abstractions for Python — Monads, Applicatives, Functors, and immutable data structures for composable, type-safe code. Installation pip install katharos Quick Start Handle optional values without None checks: from katharos.types import Maybe result = Maybe[int].Just(5) | (lambda x: Maybe[int].Just(x * 2)) # Just(10) nothing = Maybe[int].Nothing() | (lambda x: Maybe[int].Just(x * 2)) # Nothing() Model errors as values instead of exceptions: from katharos.types import Result def parse_int(s: str) -> Result[ValueError, int]: try: return Result.Success(int(s)) except ValueError as e: return Result.Failure(e) parse_int("42") | (lambda n: Result[ValueError, int].Success(n * 2)) # Success(84) parse_int("??") | (lambda n: Result[ValueError, int].Success(n * 2)) #…
Excerpt limited to ~120 words for fair-use compliance. The full article is at GitHub.