Skip to content

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

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
AlexWaygood merged 1 commit into from
Jul 25, 2023
Merged

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

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
17 changes: 11 additions & 6 deletions Tools/clinic/clinic.py
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -45,6 +45,7 @@
Protocol,
TypeGuard,
TypeVar,
cast,
overload,
)

Expand DownExpand 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
Copy link
MemberAuthor

@AlexWaygoodAlexWaygoodJul 25, 2023•
edited
Loading

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

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: assertissubclass(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.

Copy link
Contributor

@erlend-aaslanderlend-aaslandJul 25, 2023

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Thanks for writing these excellent explanations!

Copy link
MemberAuthor

@AlexWaygoodAlexWaygoodJul 25, 2023

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

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


class CConverter(metaclass=CConverterAutoRegister):
"""
Expand DownExpand 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 DownExpand 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