Merge branch 'master' into use-annotations-for-type-annotations

python · Jul 21, 2024 · e22b5b3 · e22b5b3
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diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
@@ -38,7 +38,7 @@ jobs:
         with:
           python-version: '3.8'
       - name: Install tox
-        run: pip install --upgrade 'setuptools!=50' tox==4.11.0
+        run: pip install tox==4.11.0
       - name: Setup tox environment
         run: tox run -e ${{ env.TOXENV }} --notest
       - name: Test

diff --git a/.github/workflows/mypy_primer.yml b/.github/workflows/mypy_primer.yml
@@ -39,7 +39,7 @@ jobs:
           fetch-depth: 0
       - uses: actions/setup-python@v5
         with:
-          python-version: "3.10"
+          python-version: "3.12"
       - name: Install dependencies
         run: |
           python -m pip install -U pip

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
@@ -147,6 +147,24 @@ jobs:
     - name: Test
       run: tox run -e ${{ matrix.toxenv }} --skip-pkg-install -- ${{ matrix.tox_extra_args }}
 
+  python-nightly:
+    runs-on: ubuntu-latest
+    name: Test suite with Python nightly
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '3.13-dev'
+      - name: Install tox
+        run: pip install setuptools==68.2.2 tox==4.11.0
+      - name: Setup tox environment
+        run: tox run -e py --notest
+      - name: Test
+        run: tox run -e py --skip-pkg-install -- "-n 4"
+        continue-on-error: true
+      - name: Mark as a success
+        run: exit 0
+
   python_32bits:
     runs-on: ubuntu-latest
     name: Test mypyc suite with 32-bit Python

diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -3,6 +3,248 @@
 ## Next release
 
 
+## Mypy 1.11
+
+We’ve just uploaded mypy 1.11 to the Python Package Index ([PyPI](https://pypi.org/project/mypy/)). Mypy is a static type checker for Python. This release includes new features, performance improvements and bug fixes. You can install it as follows:
+
+    python3 -m pip install -U mypy
+
+You can read the full documentation for this release on [Read the Docs](http://mypy.readthedocs.io).
+
+#### Support Python 3.12 Syntax for Generics (PEP 695)
+
+Mypy now supports the new type parameter syntax introduced in Python 3.12 ([PEP 695](https://peps.python.org/pep-0695/)).
+This feature is still experimental and must be enabled with the `--enable-incomplete-feature=NewGenericSyntax` flag, or with `enable_incomplete_feature = NewGenericSyntax` in the mypy configuration file.
+We plan to enable this by default in the next mypy feature release.
+
+This example demonstrates the new syntax:
+
+```python
+# Generic function
+def f[T](x: T) -> T: ...
+
+reveal_type(f(1))  # Revealed type is 'int'
+
+# Generic class
+class C[T]:
+    def __init__(self, x: T) -> None:
+       self.x = x
+
+c = C('a')
+reveal_type(c.x)  # Revealed type is 'str'
+
+# Type alias
+type A[T] = C[list[T]]
+```
+
+This feature was contributed by Jukka Lehtosalo.
+
+
+#### Support for `functools.partial`
+
+Mypy now type checks uses of `functools.partial`. Previously mypy would accept arbitrary arguments.
+
+This example will now produce an error:
+
+```python
+from functools import partial
+
+def f(a: int, b: str) -> None: ...
+
+g = partial(f, 1)
+
+# Argument has incompatible type "int"; expected "str"
+g(11)
+```
+
+This feature was contributed by Shantanu (PR [16939](https://github.com/python/mypy/pull/16939)).
+
+
+#### Stricter Checks for Untyped Overrides
+
+Past mypy versions didn't check if untyped methods were compatible with overridden methods. This would result in false negatives. Now mypy performs these checks when using `--check-untyped-defs`.
+
+For example, this now generates an error if using `--check-untyped-defs`:
+
+```python
+class Base:
+    def f(self, x: int = 0) -> None: ...
+
+class Derived(Base):
+    # Signature incompatible with "Base"
+    def f(self): ...
+```
+
+This feature was contributed by Steven Troxler (PR [17276](https://github.com/python/mypy/pull/17276)).
+
+
+#### Type Inference Improvements
+
+The new polymorphic inference algorithm introduced in mypy 1.5 is now used in more situations. This improves type inference involving generic higher-order functions, in particular.
+
+This feature was contributed by Ivan Levkivskyi (PR [17348](https://github.com/python/mypy/pull/17348)).
+
+Mypy now uses unions of tuple item types in certain contexts to enable more precise inferred types. Example:
+
+```python
+for x in (1, 'x'):
+    # Previously inferred as 'object'
+    reveal_type(x)  # Revealed type is 'int | str'
+```
+
+This was also contributed by Ivan Levkivskyi (PR [17408](https://github.com/python/mypy/pull/17408)).
+
+
+#### Improvements to Detection of Overlapping Overloads
+
+The details of how mypy checks if two `@overload` signatures are unsafely overlapping were overhauled. This both fixes some false positives, and allows mypy to detect additional unsafe signatures.
+
+This feature was contributed by Ivan Levkivskyi (PR [17392](https://github.com/python/mypy/pull/17392)).
+
+
+#### Better Support for Type Hints in Expressions
+
+Mypy now allows more expressions that evaluate to valid type annotations in all expression contexts. The inferred types of these expressions are also sometimes more precise. Previously they were often `object`.
+
+This example uses a union type that includes a callable type as an expression, and it no longer generates an error:
+
+```python
+from typing import Callable
+
+print(Callable[[], int] | None)  # No error
+```
+
+This feature was contributed by Jukka Lehtosalo (PR [17404](https://github.com/python/mypy/pull/17404)).
+
+
+#### Mypyc Improvements
+
+Mypyc now supports the new syntax for generics introduced in Python 3.12 (see above). Another notable improvement is signficantly faster basic operations on `int` values.
+
+ * Support Python 3.12 syntax for generic functions and classes (Jukka Lehtosalo, PR [17357](https://github.com/python/mypy/pull/17357))
+ * Support Python 3.12 type alias syntax (Jukka Lehtosalo, PR [17384](https://github.com/python/mypy/pull/17384))
+ * Fix ParamSpec (Shantanu, PR [17309](https://github.com/python/mypy/pull/17309))
+ * Inline fast paths of integer unboxing operations (Jukka Lehtosalo, PR [17266](https://github.com/python/mypy/pull/17266))
+ * Inline tagged integer arithmetic and bitwise operations (Jukka Lehtosalo, PR [17265](https://github.com/python/mypy/pull/17265))
+ * Allow specifying primitives as pure (Jukka Lehtosalo, PR [17263](https://github.com/python/mypy/pull/17263))
+
+
+#### Changes to Stubtest
+ * Ignore `_ios_support` (Alex Waygood, PR [17270](https://github.com/python/mypy/pull/17270))
+ * Improve support for Python 3.13 (Shantanu, PR [17261](https://github.com/python/mypy/pull/17261))
+
+
+#### Changes to Stubgen
+ * Gracefully handle invalid `Optional` and recognize aliases to PEP 604 unions (Ali Hamdan, PR [17386](https://github.com/python/mypy/pull/17386))
+ * Fix for Python 3.13 (Jelle Zijlstra, PR [17290](https://github.com/python/mypy/pull/17290))
+ * Preserve enum value initialisers (Shantanu, PR [17125](https://github.com/python/mypy/pull/17125))
+
+
+#### Miscellaneous New Features
+ * Add error format support and JSON output option via `--output json` (Tushar Sadhwani, PR [11396](https://github.com/python/mypy/pull/11396))
+ * Support `enum.member` in Python 3.11+ (Nikita Sobolev, PR [17382](https://github.com/python/mypy/pull/17382))
+ * Support `enum.nonmember` in Python 3.11+ (Nikita Sobolev, PR [17376](https://github.com/python/mypy/pull/17376))
+ * Support `namedtuple.__replace__` in Python 3.13 (Shantanu, PR [17259](https://github.com/python/mypy/pull/17259))
+ * Support `rename=True` in collections.namedtuple (Jelle Zijlstra, PR [17247](https://github.com/python/mypy/pull/17247))
+ * Add support for `__spec__` (Shantanu, PR [14739](https://github.com/python/mypy/pull/14739))
+
+
+#### Changes to Error Reporting
+ * Mention `--enable-incomplete-feature=NewGenericSyntax` in messages (Shantanu, PR [17462](https://github.com/python/mypy/pull/17462))
+ * Do not report plugin-generated methods with `explicit-override` (sobolevn, PR [17433](https://github.com/python/mypy/pull/17433))
+ * Use and display namespaces for function type variables (Ivan Levkivskyi, PR [17311](https://github.com/python/mypy/pull/17311))
+ * Fix false positive for Final local scope variable in Protocol (GiorgosPapoutsakis, PR [17308](https://github.com/python/mypy/pull/17308))
+ * Use Never in more messages, use ambiguous in join (Shantanu, PR [17304](https://github.com/python/mypy/pull/17304))
+ * Log full path to config file in verbose output (dexterkennedy, PR [17180](https://github.com/python/mypy/pull/17180))
+ * Added `[prop-decorator]` code for unsupported property decorators (#14461) (Christopher Barber, PR [16571](https://github.com/python/mypy/pull/16571))
+ * Suppress second error message with `:=` and `[truthy-bool]` (Nikita Sobolev, PR [15941](https://github.com/python/mypy/pull/15941))
+ * Generate error for assignment of functional Enum to variable of different name (Shantanu, PR [16805](https://github.com/python/mypy/pull/16805))
+ * Fix error reporting on cached run after uninstallation of third party library (Shantanu, PR [17420](https://github.com/python/mypy/pull/17420))
+
+
+#### Fixes for Crashes
+ * Fix daemon crash on invalid type in TypedDict (Ivan Levkivskyi, PR [17495](https://github.com/python/mypy/pull/17495))
+ * Fix crash and bugs related to `partial()` (Ivan Levkivskyi, PR [17423](https://github.com/python/mypy/pull/17423))
+ * Fix crash when overriding with unpacked TypedDict (Ivan Levkivskyi, PR [17359](https://github.com/python/mypy/pull/17359))
+ * Fix crash on TypedDict unpacking for ParamSpec (Ivan Levkivskyi, PR [17358](https://github.com/python/mypy/pull/17358))
+ * Fix crash involving recursive union of tuples (Ivan Levkivskyi, PR [17353](https://github.com/python/mypy/pull/17353))
+ * Fix crash on invalid callable property override (Ivan Levkivskyi, PR [17352](https://github.com/python/mypy/pull/17352))
+ * Fix crash on unpacking self in NamedTuple (Ivan Levkivskyi, PR [17351](https://github.com/python/mypy/pull/17351))
+ * Fix crash on recursive alias with an optional type (Ivan Levkivskyi, PR [17350](https://github.com/python/mypy/pull/17350))
+ * Fix crash on type comment inside generic definitions (Bénédikt Tran, PR [16849](https://github.com/python/mypy/pull/16849))
+
+
+#### Changes to Documentation
+ * Use inline config in documentation for optional error codes (Shantanu, PR [17374](https://github.com/python/mypy/pull/17374))
+ * Use lower-case generics in documentation (Seo Sanghyeon, PR [17176](https://github.com/python/mypy/pull/17176))
+ * Add documentation for show-error-code-links (GiorgosPapoutsakis, PR [17144](https://github.com/python/mypy/pull/17144))
+ * Update CONTRIBUTING.md to include commands for Windows (GiorgosPapoutsakis, PR [17142](https://github.com/python/mypy/pull/17142))
+
+
+#### Other Notable Improvements and Fixes
+ * Fix ParamSpec inference against TypeVarTuple (Ivan Levkivskyi, PR [17431](https://github.com/python/mypy/pull/17431))
+ * Fix explicit type for `partial` (Ivan Levkivskyi, PR [17424](https://github.com/python/mypy/pull/17424))
+ * Always allow lambda calls (Ivan Levkivskyi, PR [17430](https://github.com/python/mypy/pull/17430))
+ * Fix isinstance checks with PEP 604 unions containing None (Shantanu, PR [17415](https://github.com/python/mypy/pull/17415))
+ * Fix self-referential upper bound in new-style type variables (Ivan Levkivskyi, PR [17407](https://github.com/python/mypy/pull/17407))
+ * Consider overlap between instances and callables (Ivan Levkivskyi, PR [17389](https://github.com/python/mypy/pull/17389))
+ * Allow new-style self-types in classmethods (Ivan Levkivskyi, PR [17381](https://github.com/python/mypy/pull/17381))
+ * Fix isinstance with type aliases to PEP 604 unions (Shantanu, PR [17371](https://github.com/python/mypy/pull/17371))
+ * Properly handle unpacks in overlap checks (Ivan Levkivskyi, PR [17356](https://github.com/python/mypy/pull/17356))
+ * Fix type application for classes with generic constructors (Ivan Levkivskyi, PR [17354](https://github.com/python/mypy/pull/17354))
+ * Update `typing_extensions` to >=4.6.0 to fix Python 3.12 error (Ben Brown, PR [17312](https://github.com/python/mypy/pull/17312))
+ * Avoid "does not return" error in lambda (Shantanu, PR [17294](https://github.com/python/mypy/pull/17294))
+ * Fix bug with descriptors in non-strict-optional mode (Max Murin, PR [17293](https://github.com/python/mypy/pull/17293))
+ * Don’t leak unreachability from lambda body to surrounding scope (Anders Kaseorg, PR [17287](https://github.com/python/mypy/pull/17287))
+ * Fix issues with non-ASCII characters on Windows (Alexander Leopold Shon, PR [17275](https://github.com/python/mypy/pull/17275))
+ * Fix for type narrowing of negative integer literals (gilesgc, PR [17256](https://github.com/python/mypy/pull/17256))
+ * Fix confusion between .py and .pyi files in mypy daemon (Valentin Stanciu, PR [17245](https://github.com/python/mypy/pull/17245))
+ * Fix type of `tuple[X, Y]` expression (urnest, PR [17235](https://github.com/python/mypy/pull/17235))
+ * Don't forget that a `TypedDict` was wrapped in `Unpack` after a `name-defined` error occurred (Christoph Tyralla, PR [17226](https://github.com/python/mypy/pull/17226))
+ * Mark annotated argument as having an explicit, not inferred type (bzoracler, PR [17217](https://github.com/python/mypy/pull/17217))
+ * Don't consider Enum private attributes as enum members (Ali Hamdan, PR [17182](https://github.com/python/mypy/pull/17182))
+ * Fix Literal strings containing pipe characters (Jelle Zijlstra, PR [17148](https://github.com/python/mypy/pull/17148))
+
+
+#### Typeshed Updates
+
+Please see [git log](https://github.com/python/typeshed/commits/main?after=6dda799d8ad1d89e0f8aad7ac41d2d34bd838ace+0&branch=main&path=stdlib) for full list of standard library typeshed stub changes.
+
+
+#### Acknowledgements
+Thanks to all mypy contributors who contributed to this release:
+
+- Alex Waygood
+- Alexander Leopold Shon
+- Ali Hamdan
+- Anders Kaseorg
+- Ben Brown
+- Bénédikt Tran
+- bzoracler
+- Christoph Tyralla
+- Christopher Barber
+- dexterkennedy
+- gilesgc
+- GiorgosPapoutsakis
+- Ivan Levkivskyi
+- Jelle Zijlstra
+- Jukka Lehtosalo
+- Marc Mueller
+- Matthieu Devlin
+- Michael R. Crusoe
+- Nikita Sobolev
+- Seo Sanghyeon
+- Shantanu
+- sobolevn
+- Steven Troxler
+- Tadeu Manoel
+- Tamir Duberstein
+- Tushar Sadhwani
+- urnest
+- Valentin Stanciu
+
+I’d also like to thank my employer, Dropbox, for supporting mypy development.
+
 
 ## Mypy 1.10
 
@@ -163,7 +405,7 @@ This feature was contributed by Shantanu (PR [16756](https://github.com/python/m
 
 #### Typeshed Updates
 
-Please see [git log](https://github.com/python/typeshed/commits/main?after=7c8e82fe483a40ec4cb0a2505cfdb0f3e7cc81d9+0&branch=main&path=stdlib) for full list of standard library typeshed stub changes.
+Please see [git log](https://github.com/python/typeshed/commits/main?after=6dda799d8ad1d89e0f8aad7ac41d2d34bd838ace+0&branch=main&path=stdlib) for full list of standard library typeshed stub changes.
 
 #### Mypy 1.10.1
 

diff --git a/docs/source/command_line.rst b/docs/source/command_line.rst
@@ -1055,6 +1055,27 @@ List of currently incomplete/experimental features:
          # Without PreciseTupleTypes: tuple[int, ...]
          # With PreciseTupleTypes: tuple[()] | tuple[int] | tuple[int, int]
 
+* ``NewGenericSyntax``: this feature enables support for syntax defined
+  by :pep:`695`. For example:
+
+  .. code-block:: python
+
+     class Container[T]:  # defines a generic class
+         content: T
+
+     def first[T](items: list[T]) -> T:  # defines a generic function
+         return items[0]
+
+     type Items[T] = list[tuple[T, T]]  # defines a generic type alias
+
+* ``InlineTypedDict``: this feature enables non-standard syntax for inline
+  :ref:`TypedDicts <typeddict>`, for example:
+
+  .. code-block:: python
+
+     def test_values() -> {"int": int, "str": str}:
+         return {"int": 42, "str": "test"}
+
 
 Miscellaneous
 *************

diff --git a/docs/source/type_narrowing.rst b/docs/source/type_narrowing.rst
@@ -368,14 +368,18 @@ Limitations
 Mypy's analysis is limited to individual symbols and it will not track
 relationships between symbols. For example, in the following code
 it's easy to deduce that if :code:`a` is None then :code:`b` must not be,
-therefore :code:`a or b` will always be a string, but Mypy will not be able to tell that:
+therefore :code:`a or b` will always be an instance of :code:`C`,
+but Mypy will not be able to tell that:
 
 .. code-block:: python
 
-    def f(a: str | None, b: str | None) -> str:
+    class C:
+        pass
+
+    def f(a: C | None, b: C | None) -> C:
         if a is not None or b is not None:
-            return a or b  # Incompatible return value type (got "str | None", expected "str")
-        return 'spam'
+            return a or b  # Incompatible return value type (got "C | None", expected "C")
+        return C()
 
 Tracking these sort of cross-variable conditions in a type checker would add significant complexity
 and performance overhead.
@@ -385,9 +389,9 @@ or rewrite the function to be slightly more verbose:
 
 .. code-block:: python
 
-    def f(a: str | None, b: str | None) -> str:
+    def f(a: C | None, b: C | None) -> C:
         if a is not None:
             return a
         elif b is not None:
             return b
-        return 'spam'
+        return C()