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Revamp sys.lazy_modules #148587
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Documentation
or make it private, or make it private but expose a mappingproxy.
What are your preferences?
I presume that the PEP must be updated as well (see #145057).
cc @pablogsal @DinoV
Linked PRs
- gh-148587: Make
sys.lazy_modulesimmutable #149408 - [3.15] gh-148587: Make sys.lazy_modules match PEP and keep internal lazy submodules tra… #150014
- gh-148587: Make sys.lazy_modules match PEP and keep internal lazy submodules tracking internal #150086
- gh-148587: Document
sys.lazy_modules#150742 - [3.15] gh-148587: Document
sys.lazy_modules(GH-150742) #150795
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pablogsal commentedon Apr 25, 2026
@DinoV @Yhg1s WDTY?
pablogsal commentedon Apr 25, 2026
Perhaps we are overthinking it since I think we should preserve the simmetry with
sys.modulesand that's a dictionary.... 🤔@johnslavik what do you think?
johnslavik commentedon Apr 26, 2026
@pablogsal, fair enough -- simple is better than complex. I'll make a public module attribute exposing the frozendict of frozensets from the registry.
pablogsal commentedon May 4, 2026
Marking as release blocker. We need to reach consensus on this before beta freeze @Yhg1s @DinoV
Yhg1s commentedon May 4, 2026
I don't have a strong opinion on this one. @DinoV and @brittanyrey may have practical experience to help them form opinions?
pythongh-148587: Expose live lazy import registry as sys._lazy_modules
johnslavik commentedon May 4, 2026
Filed python/peps#4954.
pythongh-148587: Address review feedback on sys.lazy_modules
pythongh-148587: Trim sys.lazy_modules contract test and NEWS
pythongh-148587: Align sys.__getattr__ with _ctypes/zlib pattern
pythongh-148587: Use METH_VARARGS for sys.__getattr__
pythongh-148587: Pre-size and short-circuit empty in lazy modules sna…
brittanyrey commentedon May 5, 2026
I'm pretty open on how we expose it, but I do think we should expose it.
The idea of it being immutable makes sense to me--but if it's too much of a hassle right now maybe it's okay to expose it as a dict as we do with
sys.modules.hugovk commentedon May 7, 2026
This does not need to block beta 1, so moving to deferred-blocker. We can still fix this during the beta, and sooner is better than later, so please try to target b2.
[3.15] gh-148587: Make sys.lazy_modules match PEP and keep internal l…
johnslavik commentedon May 19, 2026
I believe we should document this too.
gh-148587: Make sys.lazy_modules match PEP and keep internal lazy sub…
Merge branch 'main' into pythongh-148587-doc-sys-lazy-modules
gh-148587: Document `sys.lazy_modules` (#150742)
[3.15] gh-148587: Document `sys.lazy_modules` (GH-150742)