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This implements PEP 695, Type Parameter Syntax. It adds support for: - Generic functions (def func[T](): ...) - Generic classes (class X[T](): ...) - Type aliases (type X = ...) - New scoping when the new syntax is used within a class body - Compiler and interpreter changes to support the new syntax and scoping rules Co-authored-by: Marc Mueller <30130371+cdce8p@users.noreply.github.com> Co-authored-by: Eric Traut <eric@traut.com> Co-authored-by: Larry Hastings <larry@hastings.org> Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
23 lines
1.1 KiB
ReStructuredText
23 lines
1.1 KiB
ReStructuredText
Implement :pep:`695`, adding syntactic support for generic classes, generic
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functions, and type aliases.
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A new ``type X = ...`` syntax is added for type aliases, which resolves at
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runtime to an instance of the new class ``typing.TypeAliasType``.
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The value is lazily evaluated and is accessible through the ``.__value__``
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attribute. This is implemented as a new AST node ``ast.TypeAlias``.
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New syntax (``class X[T]: ...``, ``def func[T](): ...``) is added for defining
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generic functions and classes. This is implemented as a new
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``typeparams`` attribute on the AST nodes for classes and functions.
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This node holds instances of the new AST classes ``ast.TypeVar``,
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``ast.ParamSpec``, and ``ast.TypeVarTuple``.
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``typing.TypeVar``, ``typing.ParamSpec``, ``typing.ParamSpecArgs``,
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``typing.ParamSpecKwargs``, ``typing.TypeVarTuple``, and
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``typing.Generic`` are now implemented in C rather than Python.
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There are new bytecode instructions ``LOAD_LOCALS``,
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``LOAD_CLASSDICT_OR_GLOBAL``, and ``LOAD_CLASSDICT_OR_DEREF``
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to support correct resolution of names in class namespaces.
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Patch by Eric Traut, Larry Hastings, and Jelle Zijlstra.
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