I like to use __getattr__ to give objects optional properties while avoiding issues with None. This is a simple example:
from typing import Any
class CelestialBody:
def __init__(self, name: str, mass: float | None = None) -> None:
self.name = name
self._mass = mass
return None
def __getattr__(self, name: str) -> Any:
if f"_{name}" not in self.__dict__:
raise AttributeError(f"Attribute {name} not found")
out = getattr(self, f"_{name}")
if out is None:
raise AttributeError(f"Attribute {name} not set for {self.name}")
return out
My problem is that Python tries to be nice when I raise my custom AttributeError and exposes the "private" attribute for which I am creating the interface:
AttributeError: Attribute mass not set for Earth. Did you mean: '_mass'?
Is there a standard way to suppress these recommendations?
The name recommendation logic is triggered only if the name attribute of the AttributeError is not None:
elif exc_type and issubclass(exc_type, (NameError, AttributeError)) and \
getattr(exc_value, "name", None) is not None:
wrong_name = getattr(exc_value, "name", None)
suggestion = _compute_suggestion_error(exc_value, exc_traceback, wrong_name)
if suggestion:
self._str += f". Did you mean: '{suggestion}'?"
So you can easily disable the suggestion by setting name to None when instantiating an AttributeError:
if out is None:
raise AttributeError(f"Attribute {name} not set for {self.name}", name=None)
Demo here