slicerator
A lazy-loading, fancy-sliceable iterable.
Decision gist · record as of 2026-08-14
Yes, if you need lazy-loading with fancy indexing and have a class-based data source. The low install friction, permissive license, and zero runtime dependencies make it a lightweight addition. However, the package is aging—latest release 2022-04-07—so verify it meets your Python version and use case before committing.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Low friction: pure Python wheel with no runtime dependencies.
- Maintenance is aging—last release was 2022-04-07 and the repository has not been updated since 2025-06-30, though it remains unarchived.
License · maintenance · safety
BSD (permissive) — BSD license is permissive, allowing commercial and private use with minimal restrictions.
last release 2022-04-07 (1590 days) · last repo commit 2025-06-30 · 18 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 337,812 downloads/mo, #7,444 on PyPI
Alternatives
Verify before relying
from slicerator import Slicerator
@Slicerator.from_class
class MyLazyLoader:
def __getitem__(self, i):
return thing
def __len__(self):
return number_of_things
a = MyLazyLoader()
s1 = a[::2]
data = s1[0]- Whether the package is actively maintained or in maintenance-only mode given the gap between latest release and recent commits.
- Performance characteristics when chaining multiple slicerator operations or working with very large datasets.
What it is and what it does
Slicerator is a decorator-based wrapper that turns a class with `__getitem__` and `__len__` methods into a lazy-loading, reusable iterable. Unlike a generator, a Slicerator object can be indexed multiple times and has a known length; unlike a list, it defers data loading until you actually access an element. You decorate your data-loading class with `@Slicerator.from_class`, and the wrapper automatically handles slices (e.g., `obj[::2]`), integer lists, and boolean masks—all without loading data until the final indexing operation.
The package is designed for scenarios where you want the convenience of array-like indexing and slicing but need to avoid loading everything into memory upfront. It chains slicing operations lazily, so `obj[::2][1:]` computes the combined slice without materializing intermediate results. With no runtime dependencies and a pure-Python implementation, it integrates easily into existing projects.
Use it for
- Wrapping a file reader or database query class to support array-like slicing without loading all records into memory.
- Building lazy-loading image or video frame sequences that only decode frames when indexed.
- Creating a filtered or transformed view of a dataset that defers computation until specific elements are accessed.
- Chaining multiple slice operations on large datasets to avoid intermediate materialization.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you need lazy-loading with fancy indexing and have a class-based data source.
The low install friction, permissive license, and zero runtime dependencies make it a lightweight addition. However, the package is aging—latest release 2022-04-07—so verify it meets your Python version and use case before committing.
Install
slicerator on PyPI
Before you install
Low friction: pure Python wheel with no runtime dependencies. Maintenance is aging—last release was 2022-04-07 and the repository has not been updated since 2025-06-30, though it remains unarchived.
License in practice
BSD license is permissive, allowing commercial and private use with minimal restrictions.
Quickstart
from slicerator import Slicerator
@Slicerator.from_class
class MyLazyLoader:
def __getitem__(self, i):
return thing
def __len__(self):
return number_of_things
a = MyLazyLoader()
s1 = a[::2]
data = s1[0]Verify before relying
- Whether the package is actively maintained or in maintenance-only mode given the gap between latest release and recent commits.
- Performance characteristics when chaining multiple slicerator operations or working with very large datasets.
Package facts
| License | BSD permissive |
| Python support | Not specified |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | None |
| Maintenance | Aging 1,590 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 337,812 / month, #7,444 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 4 - BetaProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.7Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9 |
Evidence: slicerator-1.1.0-py3-none-any.whl
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See also iterproxy · Lazify · lazy-import · renew · ordered-set · slicer · wraps · lazy-loader · vine