gh-145413: Fix nested attribute suggestions executing property code

[Hiumee]

Updated the code of _check_for_nested_attribute to check properties without triggering their code. This approach will still suggest them

Changed a test case to look for side effects and changed some contradictory comments

Updated the news section code to include imports so the code can be tested out of the box

Example

fromdataclassesimportdataclassfrommathimportpi@dataclassclassCircle:
radius: float@propertydefarea(self) ->float:
print("Property 'area' accessed")
returnpi*self.radius**2classContainer:
def__init__(self, inner: Circle) ->None:
self.inner=innercircle=Circle(radius=4.0)
container=Container(circle)
print(container.area)

Output

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
print(container.area)
^^^^^^^^^^^^^^
AttributeError: 'Container' object has no attribute 'area'. Did you mean '.inner.area' instead of '.area'?

It doesn't reach the print statement at all

• Issue: Nested attribute lookup for improved error messages executes property code #145413

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📚 Documentation preview 📚: https://cpython-previews--145414.org.readthedocs.build/

[python-cla-bot]

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[Hiumee]

Appears to be fixed by #146188
Would the test case in the PR still be useful to prevent regression?

Edit: It seems the new test case covers it. I'll close the issue and PR