python / python/mypy

dmypy suggest --no-any still gives suggestion with `Any`

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#18,939 2 comments 0 reactions 0 assignees View on GitHub

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Description

Bug Report

I expect --no-any to forbid Any... however...

To Reproduce

def f(x):
    if not isinstance(x, dict):
        raise AssertionError
    return x
[mypy]
check_untyped_defs = true

Expected Behavior

$ dmypy run .
...
$ dmypy suggest t.f --no-any
No guesses that match criteria!

Actual Behavior

$ dmypy suggest t.f --no-any
(object) -> typing.Dict[Any, Any]

Your Environment

  • Mypy version used: 1.15.0
  • Mypy command-line flags: see above
  • Mypy configuration options from mypy.ini (and other config files): see above
  • Python version used: 3.13.

Contributor guide

Open the contributing guide

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 by reproducing the issue with the shown Python function, mypy configuration, and dmypy suggest t.f --no-any command. Trace the dmypy suggest handling of the --no-any filter and verify that the result is No guesses that match criteria! rather than a suggestion containing Any.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
devtools
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Clearly specified
Newbie friendliness
35/100

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