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gh-104050: Argument clinic: more misc typing improvements by AlexWaygood · Pull Request #107264 · python/cpython · GitHub

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gh-104050: Argument clinic: more misc typing improvements #107264

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Merged
AlexWaygood merged 1 commit into from
Jul 25, 2023
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gh-104050: Argument clinic: more misc typing improvements #107264

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17 changes: 11 additions & 6 deletions Tools/clinic/clinic.py
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,7 @@
Protocol,
TypeGuard,
TypeVar,
cast,
overload,
)

Expand Down Expand Up @@ -2694,9 +2695,12 @@ def closure(f: CConverterClassT) -> CConverterClassT:
return closure

class CConverterAutoRegister(type):
def __init__(cls, name, bases, classdict):
add_c_converter(cls)
add_default_legacy_c_converter(cls)
def __init__(
cls, name: str, bases: tuple[type, ...], classdict: dict[str, Any]
) -> None:
converter_cls = cast(type["CConverter"], cls)
add_c_converter(converter_cls)
add_default_legacy_c_converter(converter_cls)
Comment on lines +2698 to +2703

AlexWaygood Jul 25, 2023 •
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Mypy was complaining because our type annotation for add_c_converter says (correctly) that the argument passed in has to be a subclass of CConverter. But that isn't necessarily true here, since this metaclass could theoretically be used with classes other than CConverter (it isn't, and it won't be, but mypy doesn't know that).

Ideally we could do this:

    def __init__(
        cls, name: str, bases: tuple[type, ...], classdict: dict[str, Any]
    ) -> None:
        assert issubclass(cls, CConverter)
        add_c_converter(cls)
        add_default_legacy_c_converter(cls)

But we can't... because if cls is CConverter itself, then at this point, CConverter doesn't exist in the global namespace yet! So that would fail with NameError.

I therefore elected to use typing.cast() to just tell mypy to go away here.

erlend-aasland Jul 25, 2023

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Thanks for writing these excellent explanations!

AlexWaygood Jul 25, 2023

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

I'm glad they're all making sense! :D

class CConverter(metaclass=CConverterAutoRegister):
"""
Expand Down Expand Up @@ -3174,10 +3178,10 @@ class defining_class_converter(CConverter):
def converter_init(self, *, type: str | None = None) -> None:
self.specified_type = type

def render(self, parameter, data) -> None:
def render(self, parameter: Parameter, data: CRenderData) -> None:
self._render_self(parameter, data)

def set_template_dict(self, template_dict):
def set_template_dict(self, template_dict: TemplateDict) -> None:
template_dict['defining_class_name'] = self.name


Expand Down Expand Up @@ -4048,7 +4052,7 @@ def parser_type(self) -> str:
assert isinstance(self.function, Function)
return required_type_for_self_for_parser(self.function) or self.type

def render(self, parameter, data):
def render(self, parameter: Parameter, data: CRenderData) -> None:
"""
parameter is a clinic.Parameter instance.
data is a CRenderData instance.
Expand All @@ -4064,6 +4068,7 @@ def render(self, parameter, data):
# because we render parameters in order, and self is always first.
assert len(data.impl_arguments) == 1
assert data.impl_arguments[0] == self.name
assert self.type is not None
data.impl_arguments[0] = '(' + self.type + ")" + data.impl_arguments[0]

def set_template_dict(self, template_dict: TemplateDict) -> None:
Expand Down
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