Add `deprecated-attribute` message

[jacobtylerwalls]

Current problem

Similar to deprecated-method, we could have deprecated-attribute to warn for uses like this:

>>> sqlite3.version_info
<stdin>:1: DeprecationWarning: version_info is deprecated and will be removed in Python 3.14

Desired solution

deprecated-attribute message and then add attributes that were missed from python what's new documents, such as in 3.12:

• sqlite3.version
• sqlite3.version_info
• generator.throw
• agen.throw
• sys.last_type
• sys.last_value
• sys.last_traceback
• calendar.January
• calendar.February

Additional context

The generator changes might be difficult to make, but the sys ones would be easy and high value because they were deprecated only in docs, not with code warnings.

[AmanSal1]

@jacobtylerwalls Can I work on this ?

[jacobtylerwalls]

Sure thing! Feel free to open a draft PR if you have questions about something along the way.

[AmanSal1]

@jacobtylerwalls Can you just sum up what all has to be done ?

[jacobtylerwalls]

Sure, you should take a look at the implementation of the other deprecated-* messages such as deprecated-method, look at how they are triggered, and figure out how to trigger a new similar message for attributes. You can then adapt the functional tests for deprecated-method in a very similar way. Basically, use your IDE to search for deprecated-method and just look at everything you find.

You'll probably need to trigger your check from visit_attribute() instead of visit_call.

[AmanSal1]

@jacobtylerwalls So till now what I have figured out is that:

1.DEPRECATED_ATTRIBUTE_MESSAGE = {
"W4906": (
"Using deprecated attribute %r",
"deprecated-attribute",
"The attribute is marked as deprecated and will be removed in the future.",
{"old_names": [("WXXXX", "old-deprecated-attribute")], "shared": True},
),
}
Add this message in the DeprecatedMixin class and then make change the add a function called as deprecated_attributes () in it .

Can you tell is right ?

[jacobtylerwalls]

Yep sounds right!

[AmanSal1]

@jacobtylerwalls In the file "typecheck.py," the function "visit_attributes()" will also be modified because there are multiple functions with the same name in different files. I wanted to confirm with you if this understanding is correct.

[jacobtylerwalls]

That doesn't sound quite right, I think only the visit_attribute() method needs changing in the file with the deprecation checker. If it doesn't exist you'll need to create it (it's an override).