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Title: gh-148587: Make `sys.lazy_modules` immutable by johnslavik · Pull Request #149408 · python/cpython · GitHub

Open Graph Title: gh-148587: Make `sys.lazy_modules` immutable by johnslavik · Pull Request #149408 · python/cpython

X Title: gh-148587: Make `sys.lazy_modules` immutable by johnslavik · Pull Request #149408 · python/cpython

Description: Feel free to chime in with criticism. I'm not sure this is it yet, but take it in your own hands if you want. Issue: gh-148587

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gh-148587: Make sys.lazy_modules immutable https://github.com/python/cpython/pull/149408/files#top
Show all changes 14 commits https://github.com/python/cpython/pull/149408/files
351473b gh-148587: Make sys.lazy_modules an immutable frozendict snapshot johnslavik Apr 26, 2026 https://github.com/python/cpython/pull/149408/commits/351473b6a188a71acd0524b00f19bb2577e6b1c1
083bbe9 gh-148587: Expose live lazy import registry as sys._lazy_modules johnslavik May 4, 2026 https://github.com/python/cpython/pull/149408/commits/083bbe99cf66881ca407bdf5e81b4f4c569e2521
eac60ed gh-148587: Address review feedback on sys.lazy_modules johnslavik May 5, 2026 https://github.com/python/cpython/pull/149408/commits/eac60ede1e87f8eab8008a2a79a1e7e00a256bfb
0424a64 gh-148587: Trim sys.lazy_modules contract test and NEWS johnslavik May 5, 2026 https://github.com/python/cpython/pull/149408/commits/0424a64806a0eb2c2ed31a85d7faf204dd4c6401
4404972 gh-148587: Align sys.__getattr__ with _ctypes/zlib pattern johnslavik May 5, 2026 https://github.com/python/cpython/pull/149408/commits/44049725abc3360b01a42f391dad5161ef317312
f4f8fb2 gh-148587: Use METH_VARARGS for sys.__getattr__ johnslavik May 5, 2026 https://github.com/python/cpython/pull/149408/commits/f4f8fb2a47c07af69f7d8c724e55cb7a741c0f1a
a94f4e7 gh-148587: Pre-size and short-circuit empty in lazy modules snapshot johnslavik May 5, 2026 https://github.com/python/cpython/pull/149408/commits/a94f4e7a6672819948c173088688b17859ccf127
926a02e Revert pre-size and empty fast path in lazy modules snapshot johnslavik May 5, 2026 https://github.com/python/cpython/pull/149408/commits/926a02eecdd6e9a8d2c7d92641e3a02fbe738121
ca32d07 Add docstring to sys.__getattr__ johnslavik May 5, 2026 https://github.com/python/cpython/pull/149408/commits/ca32d07bedc36ebb269f473fff119ce0cd34937b
3dff9ef Add sys.__dir__ so lazy_modules appears in tab completion johnslavik May 5, 2026 https://github.com/python/cpython/pull/149408/commits/3dff9ef08fa8da73080233945f573e8951e36ed9
2c0e3f2 Fix METH_NOARGS signature and wrap long line in sys_dir/sys_getattr johnslavik May 5, 2026 https://github.com/python/cpython/pull/149408/commits/2c0e3f2d8e89c28c7334d7ed493ec841cc55a4e1
17de69e Add sys.lazy_modules docs and fix CI test failures johnslavik May 5, 2026 https://github.com/python/cpython/pull/149408/commits/17de69ef42653eb42c32f82f818affa1f6bda1cd
46c6033 Remove internal _lazy_modules mention and bogus set_lazy_imports cros… johnslavik May 5, 2026 https://github.com/python/cpython/pull/149408/commits/46c6033a5eb6efb6944671a9fe6f759685ecac7c
e4bbea8 Fix test_sys_module_has_signatures: METH_NOARGS never has None text s… johnslavik May 17, 2026 https://github.com/python/cpython/pull/149408/commits/e4bbea82f46adf4ac426c1f400bfb45f948a15f4
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