BUG, DOC, TYP: ``empty`` and ``zeros`` runtime signatures, and missing ``device`` parameter docs by jorenham · Pull Request #30140 · numpy/numpy

jorenham · 2025-11-04T01:45:42Z

Following #30104, #30114, #30121, #30124, #30126, #30137, and #30138; this adds the missing __text_signature__s to empty, zeros, and updates the relevant stubs.
Note that because ones and full are python functions, they did not have this issue.

This also adds docs for the device parameter of zeros, which apparently was missing.

Before:

>>> import numpy as np
>>> from inspect import signature
>>> signature(np.empty)
Traceback (most recent call last):
  File "<python-input-2>", line 1, in <module>
    signature(np.empty)
    ~~~~~~~~~^^^^^^^^^^
  File "/home/joren/.local/share/uv/python/cpython-3.14-linux-x86_64-gnu/lib/python3.14/inspect.py", line 3312, in signature
    return Signature.from_callable(obj, follow_wrapped=follow_wrapped,
           ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                                   globals=globals, locals=locals, eval_str=eval_str,
                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                                   annotation_format=annotation_format)
                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/joren/.local/share/uv/python/cpython-3.14-linux-x86_64-gnu/lib/python3.14/inspect.py", line 3027, in from_callable
    return _signature_from_callable(obj, sigcls=cls,
                                    follow_wrapper_chains=follow_wrapped,
                                    globals=globals, locals=locals, eval_str=eval_str,
                                    annotation_format=annotation_format)
  File "/home/joren/.local/share/uv/python/cpython-3.14-linux-x86_64-gnu/lib/python3.14/inspect.py", line 2508, in _signature_from_callable
    return _signature_from_builtin(sigcls, obj,
                                   skip_bound_arg=skip_bound_arg)
  File "/home/joren/.local/share/uv/python/cpython-3.14-linux-x86_64-gnu/lib/python3.14/inspect.py", line 2292, in _signature_from_builtin
    raise ValueError("no signature found for builtin {!r}".format(func))
ValueError: no signature found for builtin <built-in function empty>

After:

>>> import numpy as np
>>> from inspect import signature
>>> signature(np.empty)
<Signature (shape, dtype=None, order='C', *, device=None, like=None)>
>>> signature(np.zeros)
<Signature (shape, dtype=None, order='C', *, device=None, like=None)>

…type fix

github-actions · 2025-11-04T02:05:28Z

Diff from mypy_primer, showing the effect of this PR on type check results on a corpus of open source code:

xarray (https://github.com/pydata/xarray)
+ xarray/tests/test_namedarray.py: note: In member "test_from_array_with_0d_object" of class "TestNamedArray":
+ xarray/tests/test_namedarray.py:249: error: Need type annotation for "narr"  [var-annotated]

jorenham · 2025-11-04T16:31:04Z

the primer error is a bit weird, but it's not an indiciation of a regression or something. Basically "need type annotations" means that mypy isn't able to infer the type itself, but in many cases where it also can't infer the type, mypy doesn't report this error.
So this diff doesn't really tell us much.

https://github.com/pydata/xarray/blob/ea35e64cec1a72e4c3270f60c7a937e59a36f0ce/xarray/tests/test_namedarray.py#L246-L250

charris · 2025-11-04T16:38:37Z

 add_newdoc('numpy._core.multiarray', 'empty',
    """
-    empty(shape, dtype=float, order='C', *, device=None, like=None)
+    empty(shape, dtype=None, order='C', *, device=None, like=None)


Hmm, python does pass None here, but that defaults to float64. I guess this is more accurate.

charris · 2025-11-04T16:40:47Z

Thanks Joren.

This fixes `inspect.signature` for - `np.random.BitGenerator` - `np.random.Generator` - `np.random.MT19937` - `np.random.PCG64` - `np.random.PCG64DXSM` - `np.random.Philox` - `np.random.RandomState` - `np.random.SFC64` - `np.random.SeedSequence` - `np.random.bit_generator.SeedlessSeedSequence` This also fixes a typo in `bit_generator.pxd` that accidentally defined an empty unused class `np.random.bit_generator.SeedlessSequence`. Related to #30104, #30114, #30121, #30124, #30126, #30137, #30138, #30140, #30143, #30146, #30147, and #30155

…g ``device`` parameter docs (numpy#30140) * BUG: ``empty`` and ``zeros`` runtime signatures * TYP: `empty`, `zeros`, and `ones` parameter defaults and minor shape-type fix * TST: Update `_convert2ma` test signature for `np.ma.empty`

This fixes `inspect.signature` for - `np.random.BitGenerator` - `np.random.Generator` - `np.random.MT19937` - `np.random.PCG64` - `np.random.PCG64DXSM` - `np.random.Philox` - `np.random.RandomState` - `np.random.SFC64` - `np.random.SeedSequence` - `np.random.bit_generator.SeedlessSeedSequence` This also fixes a typo in `bit_generator.pxd` that accidentally defined an empty unused class `np.random.bit_generator.SeedlessSequence`. Related to numpy#30104, numpy#30114, numpy#30121, numpy#30124, numpy#30126, numpy#30137, numpy#30138, numpy#30140, numpy#30143, numpy#30146, numpy#30147, and numpy#30155

…g ``device`` parameter docs (numpy#30140) * BUG: ``empty`` and ``zeros`` runtime signatures * TYP: `empty`, `zeros`, and `ones` parameter defaults and minor shape-type fix * TST: Update `_convert2ma` test signature for `np.ma.empty`

This fixes `inspect.signature` for - `np.random.BitGenerator` - `np.random.Generator` - `np.random.MT19937` - `np.random.PCG64` - `np.random.PCG64DXSM` - `np.random.Philox` - `np.random.RandomState` - `np.random.SFC64` - `np.random.SeedSequence` - `np.random.bit_generator.SeedlessSeedSequence` This also fixes a typo in `bit_generator.pxd` that accidentally defined an empty unused class `np.random.bit_generator.SeedlessSequence`. Related to numpy#30104, numpy#30114, numpy#30121, numpy#30124, numpy#30126, numpy#30137, numpy#30138, numpy#30140, numpy#30143, numpy#30146, numpy#30147, and numpy#30155

jorenham added 2 commits November 4, 2025 02:15

BUG: empty and zeros runtime signatures

0b20122

TYP: empty, zeros, and ones parameter defaults and minor shape-…

e9e40f3

…type fix

jorenham added 00 - Bug component: numpy._core labels Nov 4, 2025

jorenham added this to the 2.4.0 release milestone Nov 4, 2025

jorenham added 41 - Static typing 04 - Documentation labels Nov 4, 2025

jorenham changed the title ~~BUG, TYP: empty and zeros runtime signatures~~ BUG,DOC, TYP: empty and zeros runtime signatures Nov 4, 2025

jorenham changed the title ~~BUG,DOC, TYP: empty and zeros runtime signatures~~ BUG,DOC, TYP: empty and zeros runtime signatures, and missing device parameter docs Nov 4, 2025

jorenham changed the title ~~BUG,DOC, TYP: empty and zeros runtime signatures, and missing device parameter docs~~ BUG, DOC, TYP: empty and zeros runtime signatures, and missing device parameter docs Nov 4, 2025

TST: Update _convert2ma test signature for np.ma.empty

ca62ed5

This was referenced Nov 4, 2025

BUG, TYP: _core.multiarray.* function runtime signatures #30143

Merged

BUG: np.dtype and np.dtypes.* runtime signatures (C) #30146

Closed

charris reviewed Nov 4, 2025

View reviewed changes

charris merged commit 3b44dc0 into numpy:main Nov 4, 2025
79 checks passed

jorenham deleted the fix-empty-zeros-signatures branch November 4, 2025 16:41

This was referenced Nov 4, 2025

BUG, TYP: add the remaining _core.multiarray function runtime signatures #30147

Merged

BUG, DOC: ndarray dunder method runtime signatures and missing docs #30155

Merged

neutrinoceros mentioned this pull request Nov 6, 2025

TST: consider failing signature tests for numpy functions whose signatures are not accessible at runtime astropy/astropy#18842

Closed

jorenham mentioned this pull request Nov 6, 2025

BUG: numpy.random.* class runtime signatures #30164

Merged

This was referenced Nov 7, 2025

BUG: np.dtype and np.dtypes.* runtime signatures #30169

Merged

BUG, DOC: np.generic missing method runtime signatures and docs #30193

Merged

DOC: Release notes for the runtime signature changes #30208

Merged

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BUG, DOC, TYP: `empty` and `zeros` runtime signatures, and missing `device` parameter docs#30140

BUG, DOC, TYP: `empty` and `zeros` runtime signatures, and missing `device` parameter docs#30140
charris merged 3 commits into
numpy:mainfrom
jorenham:fix-empty-zeros-signatures

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