lazy
Lazy attributes for Python objects
Decision gist · record as of 2026-08-14
Yes. The package is lightweight (no dependencies), actively maintained, permissively licensed, and solves a common pattern—deferred initialization with caching—cleanly and with full type support. Install it if you need lazy attribute evaluation in your codebase.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python >= 3.5
- No runtime dependencies and low install friction.
- Actively maintained with a recent release (2026-07-04) and ongoing repository activity.
License · maintenance · safety
BSD-2-Clause (permissive) — BSD-2-Clause is permissive; you can use this package freely in commercial and private projects with minimal restrictions.
last release 2026-07-04 (41 days) · last repo commit 2026-08-07 · 53 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 517,093 downloads/mo, #6,228 on PyPI
Alternatives
Verify before relying
from lazy import lazy
class Example:
@lazy
def expensive_resource(self):
return compute_something()
obj = Example()
result = obj.expensive_resource # computed on first access
result2 = obj.expensive_resource # cached result returnedWhat it is and what it does
lazy is a single-decorator package that lets you mark methods as lazy attributes—they compute their value only once, on first access, then cache and return that result on every subsequent access. This is useful for deferring expensive initialization until it's actually needed and avoiding redundant computation within an object's lifetime.
The decorator is fully typed, so type checkers can infer the type of a lazy attribute from the method's return annotation. Common use cases include lazy initialization of resource connections (file stores, database sessions) and caching of computed values (query results, derived data). The package has no runtime dependencies, making it lightweight to add to any project.
Use it for
- Defer expensive resource initialization (file stores, database connections) until first use in a class.
- Cache computed query results or derived data within an object to avoid repeated database or API calls.
- Implement lazy property evaluation in view or request handler classes where data may not always be needed.
- Build descriptor-based lazy loading patterns for large or slow-to-initialize object attributes.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
The package is lightweight (no dependencies), actively maintained, permissively licensed, and solves a common pattern—deferred initialization with caching—cleanly and with full type support. Install it if you need lazy attribute evaluation in your codebase.
Install
lazy on PyPI
Before you install
No runtime dependencies and low install friction. Actively maintained with a recent release (2026-07-04) and ongoing repository activity.
Requires Python >= 3.5
License in practice
BSD-2-Clause is permissive; you can use this package freely in commercial and private projects with minimal restrictions.
Quickstart
from lazy import lazy
class Example:
@lazy
def expensive_resource(self):
return compute_something()
obj = Example()
result = obj.expensive_resource # computed on first access
result2 = obj.expensive_resource # cached result returnedPackage facts
| License | BSD-2-Clause permissive |
| Python support | Supports the current Python release >=3.5 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | None |
| Maintenance | Actively maintained 41 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 517,093 / month, #6,228 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableIntended Audience :: DevelopersOperating System :: OS IndependentProgramming Language :: PythonProgramming Language :: Python :: 3Typing :: Typed |
Evidence: lazy-2.0-py3-none-any.whl
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See also backports.cached-property · lazy-model · Lazify · zope.cachedescriptors · vine · lazy-object-proxy · property-manager · lazy-loader · lazy-import · proxy_tools