builtins: add a getattr overload for bool #5518
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As brought up in python#5516 Alternatives include: - Use another type var that has a value restriction - Doing something fancy with Protocols that have a __bool__ that returns a Literal (which may not work) - Doing nothing
hauntsaninja
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Diff from mypy_primer, showing the effect of this PR on open source code: pytest (https://github.com/pytest-dev/pytest.git)
- src/_pytest/config/__init__.py:1050: error: Argument 3 to "getattr" has incompatible type "bool"; expected "Optional[Namespace]" [arg-type]
tornado (https://github.com/tornadoweb/tornado.git)
- tornado/auth.py:323: error: Argument 3 to "getattr" has incompatible type "bool"; expected "Optional[str]"
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JelleZijlstra
approved these changes
May 29, 2021
JukkaL
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to JukkaL/typeshed
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Nov 22, 2021
These silence errors about missing type annotations for calls
like these:
```
x = getattr(o, 'a', [])
y = getattr(o, 'b', {})
```
This is a generalization of python#5518.
JukkaL
added a commit
that referenced
this pull request
Nov 22, 2021
These silence errors about missing type annotations for calls
like these:
```
x = getattr(o, 'a', [])
y = getattr(o, 'b', {})
```
This is basically a generalization of #5518 and other overloads we already
have.
This works around python/mypy#11572. I encountered the issue in several
places when testing recent typeshed against an internal repo.
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As brought up in #5516
Alternatives include:
a Literal (which may not work)