python / python/mypy

(🐞) No error for invalid `super` call inside an inner function

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bug
Dominant language
Python
Stars
20.6k
Forks
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PR merge metrics
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Description

class A:
    def foo(self):
        pass


class B(A):
    def foo(self):
        def inner():
            super().foo()   # RuntimeError: super(): no arguments

        inner()


B().foo()

playground

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 running the Python reproducer in the issue or its linked mypy-play playground and compare mypy's behavior with the runtime error shown. Trace the type-checking path for super() calls inside nested functions. Done means mypy reports the invalid call instead of accepting this example.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
compilers, devtools
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
42/100

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