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Title: Fix inplace arithmetic operators for numpy>=2 by apdavison · Pull Request #271 · python-quantities/python-quantities · GitHub

Open Graph Title: Fix inplace arithmetic operators for numpy>=2 by apdavison · Pull Request #271 · python-quantities/python-quantities

X Title: Fix inplace arithmetic operators for numpy>=2 by apdavison · Pull Request #271 · python-quantities/python-quantities

Description: The reason for the broken in-place behaviour reported in #254 and #258 is that with NumPy 1.x, super().__imul__(other) calls self.__array_prepare__(self, context), which calculates the correct units, but _array_prepare__ was removed from NumPy in NumPy 2.0. This is an inelegant quick fix, calling self.__array_prepare__(self, context) explicitly. It's inelegant because we have to reconstruct context, and we have similar code in multiple places. This will hopefully be enough to get a release out quickly, then we can revisit this when we have more time and fix it properly, probably by implementing __array_ufunc__. See: https://numpy.org/devdocs/release/2.0.0-notes.html#array-prepare-is-removed https://numpy.org/neps/nep-0013-ufunc-overrides.html

Open Graph Description: The reason for the broken in-place behaviour reported in #254 and #258 is that with NumPy 1.x, super().__imul__(other) calls self.__array_prepare__(self, context), which calculates the correct unit...

X Description: The reason for the broken in-place behaviour reported in #254 and #258 is that with NumPy 1.x, super().__imul__(other) calls self.__array_prepare__(self, context), which calculates the correct unit...

Opengraph URL: https://github.com/python-quantities/python-quantities/pull/271

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Fix inplace arithmetic operators for numpy>=2 https://github.com/python-quantities/python-quantities/pull/271/files#top
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aec1f81 Added unit test for in-place multiplication, division and power, base… apdavison Jan 13, 2026 https://github.com/python-quantities/python-quantities/pull/271/commits/aec1f81299f617f63413d9ff0d044da1abdee300
529fce6 Fix for failure to handle units when performing in-place multiplicati… apdavison Jan 15, 2026 https://github.com/python-quantities/python-quantities/pull/271/commits/529fce6b1c0d58c3364fef7ecc32d0ec88a83e98
0bb68ee avoid unecessary copies apdavison Jan 16, 2026 https://github.com/python-quantities/python-quantities/pull/271/commits/0bb68ee7f777b364f5dcf22cdae4c1219f2f20fa
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