PyPI · #663 most downloaded on PyPI

lazy-loader

0.626M downloads/moscientific-python/lazy-loader ↗New releases in your daily digest, changelog included.

Makes it easy to load subpackages and functions on demand.

Last release 13 days ago
21 Sep 2026
Release timing varies
gaps range from 8 days to 1.9 years
Nearly every release is documented
notes for 6 of 6 stable releases
Nothing withdrawn
no release was ever pulled
5 years old
12 releases · first in 2022

Release timeline

12 releases since 2022

20222023202420252026

20222026

One column per quarter.

Releases

0.621 Sept 2026
We're happy to announce the release of lazy-loader 0.6!
lazy-loader 0.6

We're happy to announce the release of lazy-loader 0.6!

Enhancements

improve perf, dogfood (#173).

Bug Fixes

Guard against import machinery masking out attributes (#171).

Maintenance

Support for Python 3.15 (#176).

Update release process (#177).

Contributors

3 authors added to this release (alphabetically):

@benedikt-bartscher

Jarrod Millman (@jarrodmillman)

Stefan van der Walt (@stefanv)

4 reviewers added to this release (alphabetically):

Brigitta Sipőcz (@bsipocz)

Chris Markiewicz (@effigies)

Jarrod Millman (@jarrodmillman)

Stefan van der Walt (@stefanv)

These lists are automatically generated, and may not be complete or may contain duplicates.
Open source →

0.56 Mar 2026

Add suppress_warning parameter to the load function ( #146 ).

Enhancements

Add suppress_warning parameter to the load function (#146).

Bug Fixes

fix: Remove problematic try/finally block (#137).
Make sure that __dir__ returns new copies of __all__ (#135).
Allow disabled eager loading with EAGER_IMPORT=0 (#166).

Documentation

Update release process doc (#105).
Address a few more places that used the old spelling (#130).

Maintenance

Drop Python 3.7 support (#106).
Update ruff config (#110).
Update label check action (#112).
Bump pre-commit from 3.7.0 to 3.7.1 (#118).
Rename repo to match package name (#119).
Test on Python 3.13 development releases (#120).
Update pre-commit (#122).
Update ruff config (#123).
Update GH actions (#124).
Add codespell pre-commit (#125).
Update pytest config (#126).
Bump pre-commit from 3.7.1 to 3.8.0 in the actions group (#129).
Bump pre-commit from 3.8.0 to 4.0.1 in the actions group (#132).
Update pre-commit (12/2024) (#138).
Support Python 3.13 (#139).
Drop Python 3.8 support (#140).
[pre-commit.ci] pre-commit autoupdate (#141).
Bump pre-commit from 4.0.1 to 4.1.0 in the actions group (#143).
Bump codecov/codecov-action from 4 to 5 in the actions group (#142).
Bump scientific-python/attach-next-milestone-action from bc07be829f693829263e57d5e8489f4e57d3d420 to c9cfab10ad0c67fed91b01103db26b7f16634639 in the actions group (#145).
rf: Use list.copy() instead of list() (#148).
Bump pre-commit from 4.1.0 to 4.2.0 in the actions group (#149).
[pre-commit.ci] pre-commit autoupdate (#150).
Switch to src layout, move tests to root (#151).
Update development status as Production/Stable (#108).
Add spin configuration (#152).
test: Update test cases to get full coverage (#153).
Bump actions/checkout from 4 to 5 in the actions group (#157).
Bump pre-commit from 4.2.0 to 4.3.0 in the actions group (#156).
Support for Python 3.14 (#158).
[pre-commit.ci] pre-commit autoupdate (#154).
Set dependabot cooldown and schedule for 15th of each month (#162).
Bump actions/setup-python from 5 to 6 in the actions group (#161).
Bump spin from 0.14 to 0.15 in the actions group (#164).
[pre-commit.ci] pre-commit autoupdate (#163).

Contributors

7 authors added to this release (alphabetically):

Brigitta Sipőcz (@bsipocz)
Chris Markiewicz (@effigies)
Jarrod Millman (@jarrodmillman)
Lars Grüter (@lagru)
Mark Harfouche (@hmaarrfk)
Ofek Lev (@ofek)
Stefan van der Walt (@stefanv)

7 reviewers added to this release (alphabetically):

Brigitta Sipőcz (@bsipocz)
Chris Markiewicz (@effigies)
Dan Schult (@dschult)
Jarrod Millman (@jarrodmillman)
Lars Grüter (@lagru)
Ofek Lev (@ofek)
Stefan van der Walt (@stefanv)

These lists are automatically generated, and may not be complete or may contain
duplicates.

Open source →

0.45 Apr 2024

We're happy to announce the release of lazy_loader 0.4!

lazy_loader 0.4

We're happy to announce the release of lazy_loader 0.4!

Enhancements

ENH: Add require argument to load() to accept version specifiers (#48).
Add version as __version__ (#97).

Bug Fixes

Avoid exception when __frame_data["code_context"] is None (#83).
Make lazy_load.load partially thread-safe (#90).

Documentation

Add security contact (#91).
Recommend newer Python versions to avoid race (#102).

Maintenance

Use label-check and attach-next-milestone-action (#64).
Use setuptools (#65).
Specify what goes in sdist (#66).
Use changelist (#67).
Used dependabot (#68).
Bump pre-commit from 3.3 to 3.3.3 (#69).
Bump scientific-python/attach-next-milestone-action from f94a5235518d4d34911c41e19d780b8e79d42238 to a4889cfde7d2578c1bc7400480d93910d2dd34f6 (#72).
Bump scientific-python/attach-next-milestone-action from a4889cfde7d2578c1bc7400480d93910d2dd34f6 to bc07be829f693829263e57d5e8489f4e57d3d420 (#74).
Bump actions/checkout from 3 to 4 (#75).
Bump changelist from 0.1 to 0.3 (#77).
Bump pre-commit from 3.3.3 to 3.4.0 (#76).
Use trusted publisher (#78).
Bump pre-commit from 3.4.0 to 3.5.0 (#80).
Bump changelist from 0.3 to 0.4 (#81).
Bump actions/checkout from 3 to 4 (#82).
Bump actions/setup-python from 4 to 5 (#85).
Bump pre-commit from 3.5.0 to 3.6.0 (#84).
Update pre-commit (#87).
Use setup-python pip cache (#95).
Bump codecov/codecov-action from 3 to 4 (#93).
Bump pre-commit from 3.6.0 to 3.6.2 (#100).
Bump changelist from 0.4 to 0.5 (#99).
Refuse star imports in stub loader (#101).
Bump pre-commit from 3.6.2 to 3.7.0 (#103).
Update pre-commit repos (#104).

Contributors

4 authors added to this release (alphabetically):

Chris Markiewicz (@effigies)
Dan Schult (@dschult)
Jarrod Millman (@jarrodmillman)
Stefan van der Walt (@stefanv)

5 reviewers added to this release (alphabetically):

Brigitta Sipőcz (@bsipocz)
Chris Markiewicz (@effigies)
Dan Schult (@dschult)
Jarrod Millman (@jarrodmillman)
Stefan van der Walt (@stefanv)

These lists are automatically generated, and may not be complete or may contain duplicates.

Open source →

0.330 Jun 2023

Test on Python 3.12.0-beta.2 by @jarrodmillman in #53

What's Changed

Test on Python 3.12.0-beta.2 by @jarrodmillman in #53
Update requirements by @jarrodmillman in #58
Use dependabot to update GH actions by @jarrodmillman in #60
Warn and discourage lazy.load of subpackages by @dschult in #57
Use ruff by @jarrodmillman in #59
Use dependabot to update requirements by @jarrodmillman in #61
Ignore B028 by @jarrodmillman in #62
Announce Python 3.12 support by @jarrodmillman in #63

New Contributors

@dschult made their first contribution in #57

Full Changelog: v0.2...v0.3

Open source →

Additional notes2 sources agree

Full Changelog

Merged pull requests:

Announce Python 3.12 support #63 (jarrodmillman)
Ignore B028 #62 (jarrodmillman)
Use dependabot to update requirements #61 (jarrodmillman)
Use dependabot to update GH actions #60 (jarrodmillman)
Use ruff #59 (jarrodmillman)
Update requirements #58 (jarrodmillman)
Warn and discourage lazy.load of subpackages #57 (dschult)
Test on Python 3.12.0-beta.2 #53 (jarrodmillman)

Open source →

0.221 Mar 2023

Sort returned all by @stefanv in #34

What's Changed

Sort returned all by @stefanv in #34
Fix extension substitution to work with *.pyc files by @Czaki in #39
Update optional depedencies by @jarrodmillman in #40
Update pre-commit by @jarrodmillman in #41
Update GH actions by @jarrodmillman in #42
Use codecov GH action by @jarrodmillman in #44
Update year by @jarrodmillman in #43
Update tests to improve coverage by @jarrodmillman in #45
Add information that pyi files are used in runtime when use attach_stub by @Czaki in #47

New Contributors

@Czaki made their first contribution in #39

Full Changelog: v0.1...v0.2

Open source →

Additional notes2 sources agree

Full Changelog

There were no changes since the release candidate, so see release notes for v0.2rc0 below for details.

Open source →

0.2rc017 Mar 2023pre-release

Sort returned all by @stefanv in #34

What's Changed

Sort returned all by @stefanv in #34
Fix extension substitution to work with *.pyc files by @Czaki in #39
Update optional depedencies by @jarrodmillman in #40
Update pre-commit by @jarrodmillman in #41
Update GH actions by @jarrodmillman in #42
Use codecov GH action by @jarrodmillman in #44
Update year by @jarrodmillman in #43
Update tests to improve coverage by @jarrodmillman in #45
Add information that pyi files are used in runtime when use attach_stub by @Czaki in #47

New Contributors

@Czaki made their first contribution in #39

Full Changelog: v0.1...v0.2rc0

Open source →

Additional notes2 sources agree

Full Changelog

Closed issues:

Allow to not fail on stub attach in frozen apps #38
Stub files with absolute imports #36
Help to packaging Debian package #35
conda upload #33
Possible issues with partial lazy loading #32
Type hints/Mypy best practices? #28
Re-export non descendant attribute? #27
This is awesome #6

Merged pull requests:

Add information that pyi files are used in runtime when use attach\_stub #47 (Czaki)
Update tests to improve coverage #45 (jarrodmillman)
Use codecov GH action #44 (jarrodmillman)
Update year #43 (jarrodmillman)
Update GH actions #42 (jarrodmillman)
Update pre-commit #41 (jarrodmillman)
Update optional dependencies #40 (jarrodmillman)
Fix extension substitution to work with \*.pyc files #39 (Czaki)
Sort returned __all__ #34 (stefanv)

0.121 Sept 2022

Add the packaging infrastructure by @tupui in https://github.com/scientific-python/lazy_loader/pull/2

What's Changed

Add the packaging infrastructure by @tupui in https://github.com/scientific-python/lazy_loader/pull/2
Run pre-commit hooks by @tupui in https://github.com/scientific-python/lazy_loader/pull/3
Simplify delayed exception handling and improve reporting by @stefanv in https://github.com/scientific-python/lazy_loader/pull/4
Add contributor README by @stefanv in https://github.com/scientific-python/lazy_loader/pull/5
DOC fix missing comma in usage example in README.md by @adrinjalali in https://github.com/scientific-python/lazy_loader/pull/7
Avoid conflicts when function is implemented in same-named submodule by @stefanv in https://github.com/scientific-python/lazy_loader/pull/9
feat: add attach_stub function to load imports from type stubs by @tlambert03 in https://github.com/scientific-python/lazy_loader/pull/10
Specify lower bounds on dependencies by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/15
Update precommit hooks by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/16
Split out linting CI from testing by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/17
Update GH actions by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/18
Test on more versions and platforms by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/19
Lint toml files by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/20
Add classifiers by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/21
Document release process by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/22
Measure test coverage by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/23
Lower min required Python version to 3.7 by @donatasm in https://github.com/scientific-python/lazy_loader/pull/14
Fix typos by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/25
Add test and coverage badges by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/26
Refer to SPEC for stub usage by @stefanv in https://github.com/scientific-python/lazy_loader/pull/29
Update precommit hooks by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/30
Update classifiers by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/31

New Contributors

@tupui made their first contribution in https://github.com/scientific-python/lazy_loader/pull/2
@stefanv made their first contribution in https://github.com/scientific-python/lazy_loader/pull/4
@adrinjalali made their first contribution in https://github.com/scientific-python/lazy_loader/pull/7
@tlambert03 made their first contribution in https://github.com/scientific-python/lazy_loader/pull/10
@jarrodmillman made their first contribution in https://github.com/scientific-python/lazy_loader/pull/15
@donatasm made their first contribution in https://github.com/scientific-python/lazy_loader/pull/14

Full Changelog: https://github.com/scientific-python/lazy_loader/compare/v0.0...v0.1

Open source →

Additional notes

What's Changed

Add the packaging infrastructure by @tupui in #2
Run pre-commit hooks by @tupui in #3
Simplify delayed exception handling and improve reporting by @stefanv in #4
Add contributor README by @stefanv in #5
DOC fix missing comma in usage example in README.md by @adrinjalali in #7
Avoid conflicts when function is implemented in same-named submodule by @stefanv in #9
feat: add attach_stub function to load imports from type stubs by @tlambert03 in #10
Specify lower bounds on dependencies by @jarrodmillman in #15
Update precommit hooks by @jarrodmillman in #16
Split out linting CI from testing by @jarrodmillman in #17
Update GH actions by @jarrodmillman in #18
Test on more versions and platforms by @jarrodmillman in #19
Lint toml files by @jarrodmillman in #20
Add classifiers by @jarrodmillman in #21
Document release process by @jarrodmillman in #22
Measure test coverage by @jarrodmillman in #23
Lower min required Python version to 3.7 by @donatasm in #14
Fix typos by @jarrodmillman in #25
Add test and coverage badges by @jarrodmillman in #26
Refer to SPEC for stub usage by @stefanv in #29
Update precommit hooks by @jarrodmillman in #30
Update classifiers by @jarrodmillman in #31

New Contributors

@tupui made their first contribution in #2
@stefanv made their first contribution in #4
@adrinjalali made their first contribution in #7
@tlambert03 made their first contribution in #10
@jarrodmillman made their first contribution in #15
@donatasm made their first contribution in #14

Full Changelog: v0.0...v0.1

Additional notes2 sources agree

Full Changelog

Merged pull requests:

Update classifiers #31 (jarrodmillman)
Update precommit hooks #30 (jarrodmillman)
Refer to SPEC for stub usage #29 (stefanv)

Open source →

0.1rc329 Aug 2022pre-release

DOC fix missing comma in usage example in README.md by @adrinjalali in https://github.com/scientific-python/lazy_loader/pull/7

What's Changed

DOC fix missing comma in usage example in README.md by @adrinjalali in https://github.com/scientific-python/lazy_loader/pull/7
Avoid conflicts when function is implemented in same-named submodule by @stefanv in https://github.com/scientific-python/lazy_loader/pull/9
feat: add attach_stub function to load imports from type stubs by @tlambert03 in https://github.com/scientific-python/lazy_loader/pull/10
Specify lower bounds on dependencies by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/15
Update precommit hooks by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/16
Split out linting CI from testing by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/17
Update GH actions by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/18
Test on more versions and platforms by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/19
Lint toml files by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/20
Add classifiers by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/21
Document release process by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/22
Measure test coverage by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/23
Lower min required Python version to 3.7 by @donatasm in https://github.com/scientific-python/lazy_loader/pull/14
Fix typos by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/25
Add test and coverage badges by @jarrodmillman in https://github.com/scientific-python/lazy_loader/pull/26

New Contributors

@adrinjalali made their first contribution in https://github.com/scientific-python/lazy_loader/pull/7
@tlambert03 made their first contribution in https://github.com/scientific-python/lazy_loader/pull/10
@jarrodmillman made their first contribution in https://github.com/scientific-python/lazy_loader/pull/15
@donatasm made their first contribution in https://github.com/scientific-python/lazy_loader/pull/14

Full Changelog: https://github.com/scientific-python/lazy_loader/compare/v0.1rc2...v0.1rc3

Open source →

Additional notes

What's Changed

DOC fix missing comma in usage example in README.md by @adrinjalali in #7
Avoid conflicts when function is implemented in same-named submodule by @stefanv in #9
feat: add attach_stub function to load imports from type stubs by @tlambert03 in #10
Specify lower bounds on dependencies by @jarrodmillman in #15
Update precommit hooks by @jarrodmillman in #16
Split out linting CI from testing by @jarrodmillman in #17
Update GH actions by @jarrodmillman in #18
Test on more versions and platforms by @jarrodmillman in #19
Lint toml files by @jarrodmillman in #20
Add classifiers by @jarrodmillman in #21
Document release process by @jarrodmillman in #22
Measure test coverage by @jarrodmillman in #23
Lower min required Python version to 3.7 by @donatasm in #14
Fix typos by @jarrodmillman in #25
Add test and coverage badges by @jarrodmillman in #26

New Contributors

@adrinjalali made their first contribution in #7
@tlambert03 made their first contribution in #10
@jarrodmillman made their first contribution in #15
@donatasm made their first contribution in #14

Full Changelog: v0.1rc2...v0.1rc3

Additional notes2 sources agree

Full Changelog

Merged pull requests:

Add test and coverage badges #26 (jarrodmillman)
Fix typos #25 (jarrodmillman)
Measure test coverage #23 (jarrodmillman)
Document release process #22 (jarrodmillman)
Add classifiers #21 (jarrodmillman)
Lint toml files #20 (jarrodmillman)
Test on more versions and platforms #19 (jarrodmillman)
Update GH actions #18 (jarrodmillman)
Split out linting CI from testing #17 (jarrodmillman)
Update precommit hooks #16 (jarrodmillman)
Specify lower bounds on dependencies #15 (jarrodmillman)
Lower min required Python version to 3.7 #14 (donatasm)
feat: add attach_stub function to load imports from type stubs #10 (tlambert03)
Avoid conflicts when function is implemented in same-named submodule #9 (stefanv)
DOC fix missing comma in usage example in README.md #7 (adrinjalali)

0.1rc210 Mar 2022pre-release

Simplify delayed exception handling and improve reporting by @stefanv in https://github.com/scientific-python/lazy_loader/pull/4

What's Changed

Simplify delayed exception handling and improve reporting by @stefanv in https://github.com/scientific-python/lazy_loader/pull/4
Add contributor README by @stefanv in https://github.com/scientific-python/lazy_loader/pull/5

Full Changelog: https://github.com/scientific-python/lazy_loader/compare/v0.1rc1...v0.1rc2

Open source →

Additional notes

What's Changed

Simplify delayed exception handling and improve reporting by @stefanv in #4
Add contributor README by @stefanv in #5

Full Changelog: v0.1rc1...v0.1rc2

Open source →

Additional notes2 sources agree

Full Changelog

Merged pull requests:

Add contributor README #5 (stefanv)
Simplify delayed exception handling and improve reporting #4 (stefanv)

Open source →

0.1rc11 Mar 2022pre-release

Add the packaging infrastructure by @tupui in https://github.com/scientific-python/lazy_loader/pull/2

What's Changed

Add the packaging infrastructure by @tupui in https://github.com/scientific-python/lazy_loader/pull/2
Run pre-commit hooks by @tupui in https://github.com/scientific-python/lazy_loader/pull/3

New Contributors

@tupui made their first contribution in https://github.com/scientific-python/lazy_loader/pull/2

Full Changelog: https://github.com/scientific-python/lazy_loader/compare/v0.0...v0.1rc1

Open source →

Additional notes

What's Changed

Add the packaging infrastructure by @tupui in #2
Run pre-commit hooks by @tupui in #3

New Contributors

@tupui made their first contribution in #2

Full Changelog: v0.0...v0.1rc1

Open source →

Additional notes2 sources agree

Full Changelog

Closed issues:

Create package on pypi #1

Merged pull requests:

Run pre-commit hooks #3 (tupui)
Add the packaging infrastructure #2 (tupui)

* This Changelog was automatically generated by github_changelog_generator

Open source →

lazy-loader

Release timeline

Releases

lazy-loader 0.6

Enhancements

Bug Fixes

Maintenance

Contributors

lazy-loader 0.6rc0

Enhancements

Bug Fixes

Maintenance

Contributors

Enhancements

Bug Fixes

Documentation

Maintenance

Contributors

lazy_loader 0.4

Enhancements

Bug Fixes

Documentation

Maintenance

Contributors

What's Changed

New Contributors

What's Changed

New Contributors

What's Changed

New Contributors

What's Changed

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