Blosc/python-blosc2

Add subclass for decompressed arrays

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#464 opened on Sep 9, 2025

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good first issue

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Description

Following this comment, add a thinly wrapped native Blosc2 class for decompressed arrays, which are currently just plain NumPy arrays. Would have to support certain additional operations and comparisons (==, __array_namespace__()), but it will inherit most of the useful machinery directly from NumPy.

Would have to change np.empty references for loading slices etc. from C functions in the code base, possibly some other things.

Contributor guide

Research direction
Read the referenced discussion comment to understand the requirements, then examine how decompressed arrays are currently handled and identify where to add the subclass.
Tech stack
python
Domain
backenddata engineering
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
PythonNumPy
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65