# AN-2026-0768: NumPy 2.0 (Jun 16, 2024) removed ~100 main-namespace aliases and functions: "`np.NaN` was removed in the NumPy 2.0 release" (np.float_, np.Inf, np.string_, np.product, ...)

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- id: AN-2026-0768 (version 1; cite https://breakwire.org/claim/AN-2026-0768/v/1)
- kind: breaking · status: active · review: editor
- source: <https://numpy.org/doc/stable/numpy_2_0_migration_guide.html#:~:text=removed%20member>
- more sources: <https://github.com/numpy/numpy/blob/v2.5.4/numpy/__init__.py> <https://github.com/numpy/numpy/blob/v2.5.4/numpy/_expired_attrs_2_0.py> <https://github.com/numpy/numpy/blob/v2.5.4/doc/source/numpy_2_0_migration_guide.rst> <https://numpy.org/doc/stable/release/2.0.0-notes.html#:~:text=Alias%20np.NaN%20has%20been%20removed>
- event date: 2024-06-16
- services: numpy, python
- affected: pypi:numpy >=2.0.0
- severity: high
- 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 2.0 release notes (opened 2026-11-04) list removed main-namespace members, among them the aliases np.float_ (use np.float64), np.complex_ (np.complex128), np.longfloat, np.cfloat, np.string_ (np.bytes_), np.unicode_ (np.str_), np.Inf / np.Infinity / np.infty (np.inf), np.NaN (np.nan), np.mat (np.asmatrix), and functions such as np.asfarray, np.issubclass_, np.find_common_type, np.round_, np.safe_eval, np.deprecate, np.recfromcsv/np.recfromtxt and np.msort.  [✓0 ✗0]
1. The NumPy 2.0 migration guide's table of removed members also lists np.alltrue (use np.all), np.sometrue (np.any), np.product (np.prod), np.cumproduct (np.cumprod), np.cast, np.source and np.NINF/np.PINF, each with its replacement.  [✓0 ✗0]
2. numpy/__init__.py (v2.5.4) raises AttributeError "`np.<name>` was removed in the NumPy 2.0 release. <migration note>" for names in numpy/_expired_attrs_2_0.py; some removed names (product, cumproduct, msort) raise the plain "module 'numpy' has no attribute '<name>'" instead. Reproduced 2026-11-04 with numpy 2.0.2, 2.3.5, 2.4.4 and 2.5.4 on CPython 3.12.  [✓0 ✗0]
3. numpy 2.0.0 was uploaded to PyPI on 2024-06-16; the latest release is 2.5.4, so any unpinned numpy install gets these removals.  [✓0 ✗0]

## Fix
```text
Use the replacement named in the error (np.nan, np.inf, np.float64, np.complex128, np.bytes_, np.str_, np.prod, np.cumprod, np.all, np.any, np.round, np.asarray(x, dtype=...), np.sort(a, axis=0), ...). Ruff rule NPY201 rewrites most of these automatically (the migration guide recommends it). If the call is in a dependency, upgrade it to a NumPy 2-compatible release; as a stopgap pin numpy<2.
```

## Error signatures
- substring: `was removed in the NumPy 2.0 release` (numpy/__init__.py __getattr__ (v2.5.4); reproduced on numpy 2.0.2-2.5.4)
- code: `module 'numpy' has no attribute 'product'` (numpy/__init__.py fallback; reproduced on numpy 2.0.2)
- code: `module 'numpy' has no attribute 'cumproduct'` (numpy/__init__.py fallback; reproduced on numpy 2.0.2)
- code: `module 'numpy' has no attribute 'msort'` (numpy/__init__.py fallback; reproduced on numpy 2.0.2)

## Outcome reports (0)
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## History
- v1 2026-11-04 by wire-editor: filed from primary source opened 2026-10-28