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- 11 commits
- 26 files changed
- 5 contributors
Commits on Apr 21, 2026
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Use WAL with SQLite cache, fix close (#21154)
This is the more modern way to manage concurrency with SQLite. Relevant to current discussion, it means concurrent mypy runs using the cache will wait for each other, rather than fail SQLite also claims this is significantly faster, but I haven't yet done a good profile (If you are profiling this, note that WAL is a persistent setting, so you will want to delete the cache). This might also allow removing the `PRAGMA synchronous=OFF` Finally, I also explicitly close the connection in main. This is relevant to this change, because it forces checkpointing of the WAL, which keeps reads fast, reduces disk space and means the cache.db remains a single self-contained file under regular use Fixes #21136, see also discussion in #13916 For what it's worth, I feel there are many legitimate uses of concurrent mypy. At work, we often share cache between multiple projects. At home, I often end up having parallel runs with a debugger while working on mypy (although this PR just makes those ones hang waiting for the lock lol) --------- Co-authored-by: Ivan Levkivskyi <[email protected]>
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Only set journal mode in coordinator (#21217)
This should reduce test flakiness (esp. on Windows). IIUC this setting is per database, so setting it only in coordinator (main process) should be enough.
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Correctly aggregate narrowing information on parent expressions (#21206)
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Fix is_overlapping_types for generic callables (#21208)
Fixes #21182 This issue exposed this pre-existing deficiency in is_overlapping_types
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Avoid widening types in conditional_types (#21242)
Fixes #21181 Another pre-existing issue exposed by narrowing improvements
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Fix match statement semantics for "or" pattern (#21156)
Fixes mypyc/mypyc#1166 Authored by Codex
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Initial support for Python 3.15.0a8 (#21255)
Some minor changes to be able to compile mypy with mypyc on Python 3.15.0a8. - Update `typing-extensions` to `>=4.14.0` for Python `>=3.15` due to the removal of `typing.no_type_check_decorator` python/cpython#133601 https://docs.python.org/3/library/typing.html#typing.no_type_check_decorator https://github.com/python/typing_extensions/blob/4.14.0/CHANGELOG.md - `TypeAliasType.__qualname__` was added in python/cpython#139817 - Some new FutureWarnings for b64_decode python/cpython#125346 python/cpython#141128
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[mypyc] Set dunder attrs when adding module to sys.modules (#21275)
Recently there was a change to add native modules to `sys.modules` before they are executed to be able to detect circular imports. This introduced a regression when the module is a package that imports objects from other files within the package, eg. `from pkg.file import something` inside `pkg/__init__.py`. Such imports result in an exception `ModuleNotFoundError: No module named 'pkg.file'; 'pkg' is not a package.`, for example when trying to upgrade mypy in [black](https://github.com/psf/black/actions/runs/23933086642/job/69803937853?pr=5071). This error is raised because Python expects the parent module of `file` to have the `__path__` attribute set when [resolving the import](https://github.com/python/cpython/blob/main/Lib/importlib/_bootstrap.py#L1226) but we don't set this attribute before adding the `pkg` module to `sys.modules`. So use existing functions to set relevant dunder attributes (`__path__` for packages and `__file__`, `__spec__`, and `__package__` for all) before registering the module in `sys.modules`. Don't skip compilation for `__init__.py` files in separate compilation mode to make this possible to test. Use `Py_CLEAR` instead of `Py_DECREF` on the import object on failure in `CPyImport_ImportNative` as the import object might be freed when deleting it from `sys.modules`. This triggered an assertion when running tests with a debug build of cpython.
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Fix slicing with nonstrict optional (#21282)
Fixes #21261 I didn't add a regression test because you need custom fixtures and I just don't think any nonstrict optional change is worth the trouble
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