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TST,TYP: Fix a python 3.11 failure for the GenericAlias tests - #21543

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May 21, 2022
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TST,TYP: Fix a python 3.11 failure for the GenericAlias tests#21543
mattip merged 2 commits into
numpy:mainfrom
BvB93:alias

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@BvB93 BvB93 commented May 20, 2022

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Closes #21526

Fixes (sort of...) a python 3.11 issue wherein the npt._GenericAlias class (not instance) can now raise when used as a type parameter, as typing expects an iterable for the __parameter__ attribute but instead gets a property descriptor object.

The fix consists of simply not using npt._GenericAlias as a type parameter, and instead just stringify the expression. As the relevant class is never exposed in Python >=3.9 in the first place (and never will), I don't feel it's worth to implement a more rigorous fix.

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mattip commented May 20, 2022

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As the relevant class is never exposed in Python >=3.9 in the first place

So could we avoid it altogether, or is it needed for some other obscure reason? If we cannot drop it now, but can drop FuncType once we drop support for 3.9, a comment would be nice.

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BvB93 commented May 20, 2022

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So could we avoid it altogether, or is it needed for some other obscure reason?

npt._GenericAlias is a python 3.8 backport of types.GenericAlias and the purpose of these tests is to verify that they share the same semantics. As the latter does not exist in 3.8 we have to run tests on later python versions if we want to directly compare the backport to its original.

Adding a comment is a good idea though, I'll add one in a bit.

@mattip
mattip merged commit bcdecb3 into numpy:main May 21, 2022
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mattip commented May 21, 2022

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Thanks @BvB93

@EwoutH EwoutH mentioned this pull request May 23, 2022
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EwoutH commented May 23, 2022

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Thanks a lot for this effort! While the previous error is now gone, it seems that test_generic_alias.py still doesn't pass in the CI with Python 3.11, generating the following failures:

Failure summary 
=================================== FAILURES ===================================
_________________ TestGenericAlias.test_pass[__dir__-<lambda>] _________________

self = <numpy.typing.tests.test_generic_alias.TestGenericAlias object at 0x7f7475f1a810>
name = '__dir__', func = <function TestGenericAlias.<lambda> at 0x7f74850974c0>

    @pytest.mark.parametrize("name,func", [
        ("__init__", lambda n: n),
        ("__init__", lambda n: _GenericAlias(np.ndarray, Any)),
        ("__init__", lambda n: _GenericAlias(np.ndarray, (Any,))),
        ("__init__", lambda n: _GenericAlias(np.ndarray, (Any, Any))),
        ("__init__", lambda n: _GenericAlias(np.ndarray, T1)),
        ("__init__", lambda n: _GenericAlias(np.ndarray, (T1,))),
        ("__init__", lambda n: _GenericAlias(np.ndarray, (T1, T2))),
        ("__origin__", lambda n: n.__origin__),
        ("__args__", lambda n: n.__args__),
        ("__parameters__", lambda n: n.__parameters__),
        ("__reduce__", lambda n: n.__reduce__()[1:]),
        ("__reduce_ex__", lambda n: n.__reduce_ex__(1)[1:]),
        ("__mro_entries__", lambda n: n.__mro_entries__([object])),
        ("__hash__", lambda n: hash(n)),
        ("__repr__", lambda n: repr(n)),
        ("__getitem__", lambda n: n[np.float64]),
        ("__getitem__", lambda n: n[ScalarType][np.float64]),
        ("__getitem__", lambda n: n[Union[np.int64, ScalarType]][np.float64]),
        ("__getitem__", lambda n: n[Union[T1, T2]][np.float32, np.float64]),
        ("__eq__", lambda n: n == n),
        ("__ne__", lambda n: n != np.ndarray),
        ("__dir__", lambda n: dir(n)),
        ("__call__", lambda n: n((1,), np.int64, BUFFER)),
        ("__call__", lambda n: n(shape=(1,), dtype=np.int64, buffer=BUFFER)),
        ("subclassing", lambda n: _get_subclass_mro(n)),
        ("pickle", lambda n: n == pickle.loads(pickle.dumps(n))),
    ])
    def test_pass(self, name: str, func: FuncType) -> None:
        """Compare `types.GenericAlias` with its numpy-based backport.
    
        Checker whether ``func`` runs as intended and that both `GenericAlias`
        and `_GenericAlias` return the same result.
    
        """
        value = func(NDArray)
    
        if sys.version_info >= (3, 9):
            value_ref = func(NDArray_ref)
>           assert value == value_ref
E           AssertionError: assert ['T', '__abs_...array__', ...] == ['T', '__abs_...array__', ...]
E             At index 99 diff: '__xor__' != '__unpacked__'
E             Right contains one more item: 'view'
E             Use -v to get the full diff

func       = <function TestGenericAlias.<lambda> at 0x7f74850974c0>
name       = '__dir__'
self       = <numpy.typing.tests.test_generic_alias.TestGenericAlias object at 0x7f7475f1a810>
value      = ['T', '__abs__', '__add__', '__and__', '__args__', '__array__', ...]
value_ref  = ['T', '__abs__', '__add__', '__and__', '__args__', '__array__', ...]

../../builds/venv/lib/python3.11/site-packages/numpy-1.23.0.dev0+1280.ga2d2b5691-py3.11-linux-x86_64.egg/numpy/typing/tests/test_generic_alias.py:86: AssertionError

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BvB93 deleted the alias branch May 23, 2022 11:57
@BvB93 BvB93 mentioned this pull request May 26, 2022
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@charris charris mentioned this pull request Jun 3, 2022
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BUG: Python 3.11.0b1, test_generic_alias, TypeError: 'property' object is not iterable

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@BvB93 @mattip @EwoutH