# AN-2026-0769: NumPy 1.24 (Dec 18, 2022) removed the np.float / np.int / np.complex / np.object / np.str aliases: "module 'numpy' has no attribute 'float'. `np.float` was a deprecated alias for the builtin `float`"

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- id: AN-2026-0769 (version 1; cite https://breakwire.org/claim/AN-2026-0769/v/1)
- kind: breaking · status: active · review: editor
- source: <https://numpy.org/doc/stable/release/1.24.0-notes.html#:~:text=The%20deprecation%20for%20the%20aliases>
- more sources: <https://github.com/numpy/numpy/blob/v2.5.4/numpy/__init__.py> <https://github.com/numpy/numpy/blob/v2.5.4/doc/source/release/1.24.0-notes.rst>
- event date: 2022-12-18
- services: numpy, python
- affected: pypi:numpy >=1.24.0
- severity: medium
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. The NumPy 1.24.0 release notes (opened 2026-11-04), Expired deprecations: the deprecation of the aliases np.object, np.bool, np.float, np.complex, np.str and np.int (introduced in NumPy 1.20) is expired; some of them also give a FutureWarning because they will map to NumPy scalars in the future.  [✓0 ✗0]
1. In current NumPy (numpy/__init__.py v2.5.4), np.float, np.int, np.complex, np.str and np.object raise AttributeError "module 'numpy' has no attribute '<name>'." followed by "`np.<name>` was a deprecated alias for the builtin `<name>`. To avoid this error in existing code, use `<name>` by itself." Reproduced 2026-11-04 on numpy 2.0.2-2.5.4.  [✓0 ✗0]
2. numpy 1.24.0 was uploaded to PyPI on 2022-12-18; old code and pinned libraries that still use these aliases fail on any current numpy. (np.bool is defined again in NumPy 2.x as the NumPy bool scalar.)  [✓0 ✗0]

## Fix
```text
Use the Python builtin (float, int, complex, str, object); where a NumPy dtype was meant use np.float64, np.int64 / np.int32, np.complex128, np.str_. Ruff NPY001 flags these. If a dependency uses them, upgrade it; pinning numpy<1.24 is only a short-term stopgap.
```

## Error signatures
- substring: `was a deprecated alias for the builtin` (numpy/__init__.py _msg (v2.5.4); reproduced on numpy 2.0.2-2.5.4)
- code: `module 'numpy' has no attribute 'float'` (numpy/__init__.py _msg; reproduced on numpy 2.5.4)
- code: `module 'numpy' has no attribute 'int'` (numpy/__init__.py _msg; reproduced on numpy 2.5.4)
- code: `module 'numpy' has no attribute 'complex'` (numpy/__init__.py _msg)
- code: `module 'numpy' has no attribute 'object'` (numpy/__init__.py _msg)
- code: `module 'numpy' has no attribute 'str'` (numpy/__init__.py _msg)

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0769/reports_

## History
- v1 2026-11-04 by wire-editor: filed from primary source opened 2026-10-28