python / python/mypy

Attributes of property objects can't be accessed

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#8,085 4 comments 8 reactions 0 assignees View on GitHub

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false-positive feature priority-1-normal
Dominant language
Python
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Description

Originally reported by @ilevkivskyi in https://github.com/python/mypy/issues/220#issuecomment-445773320:

Another thing that doesn't work came in #6045: accessing attributes of a property object in the class body (for example fset, fget etc). This can be probably partially solved by some special casing in checkmember.py.

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start in checkmember.py and reproduce the class-body access case described in the issue, such as reading fset or fget from a property object. Determine which property attributes should be recognized and add or update coverage so those accesses receive the intended type-checking behavior.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
devtools
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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