Plugin's get_type_analyze_hook is not used for Annotated type in type alias or generic specialization
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描述
Bug Report
Mypy doesn't use plugin's get_type_analyze_hook for Annotated type used in type alias or generic specialization. However, the hook is used for custom types (not Annotated) used in these contexts, and it's also called for Annotated used in other contexts.
To Reproduce
plugin.py
from typing import Callable
from mypy.plugin import AnalyzeTypeContext, Plugin
from mypy.types import NoneType, Type
def plugin(version: str):
return MyPlugin
class MyPlugin(Plugin):
def get_type_analyze_hook(self, fullname: str) -> Callable[[AnalyzeTypeContext], Type] | None:
if fullname in {'typing.Annotated', 'typing_extensions.Annotated'}:
return _type_analyze
return None
def _type_analyze(ctx: AnalyzeTypeContext) -> Type:
ctx.api.note('Analyzing type of Annotated[...]', ctx.context)
return NoneType() # for the sake of example
module.py
from typing import Annotated, Generic, TypeAlias, TypeVar, reveal_type
AnnotatedTA: TypeAlias = Annotated[dict, None]
typed_with_alias: AnnotatedTA
reveal_type(typed_with_alias) # Revealed type is "builtins.dict[Any, Any]"
typed_directly: Annotated[dict, None] # Analyzing type of Annotated[...]
reveal_type(typed_directly) # Revealed type is "None", as expected
T = TypeVar('T')
class GenericType(Generic[T]):
dummy: T
class Specialization(GenericType[Annotated[dict, None]]):
...
reveal_type(Specialization().dummy) # Revealed type is "builtins.dict[Any, Any]"
Expected Behavior
All revealed types are None as requested by _type_analyze hook
Actual Behavior
Only directly typed variable typed_directly has the type requested by plugin
Your Environment
- Mypy version used: 1.10.1
- Mypy command-line flags: none
- Mypy configuration options from
mypy.ini(and other config files):plugins = plugin.py - Python version used: 3.8, 3.12
Background
I'm writing a plugin which generates TypedDictType for Annotated[dict, ...] annotations based on some external configuration files. The arguments to Annotated are string literals, so I can't really use generics. In runtime these are just normal dicts.
贡献指南
从这里开始
- 先读完整个 Issue,再读项目的贡献指南。
- 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
- Fork 仓库,在一个分支上完成修改。
- 提交 Pull Request,并在描述里引用这个 Issue 编号。
调研方向
首先使用报告中的 Python 和 mypy 版本运行 plugin.py 和 module.py reproducer,然后跟踪 Annotated 在直接使用、TypeAlias 和泛型特化情况下的类型分析。完成标准是 hook 在这三种情况下都被调用,并且每个 reveal_type 都按 _type_analyze 的要求报告 None。
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