Fix inplace arithmetic operators for numpy>=2#271
Merged
apdavison merged 3 commits intopython-quantities:masterfrom Jan 16, 2026
Merged
Fix inplace arithmetic operators for numpy>=2#271apdavison merged 3 commits intopython-quantities:masterfrom
apdavison merged 3 commits intopython-quantities:masterfrom
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…on and division with NumPy 2.x The reason for the failure is that with NumPy 1.25, `super().__imul__(other)` calls `self.__array_prepare__(self, context)`, but `_array_prepare__` was removed in NumPy 2.0. Long-term, we should probably implement `__array_ufunc__`. This inelegant fix will hopefully be enough to get a release out quickly, then we can revisit this when we have more time and fix it properly
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I think this looks good, thank you for taking the time to fix this! Possibly a minor nit: cself = self.copy()
cother = other.copy()I guess those calls to copy could be made in the else branch only, no? Anyhow, +1 to merge from me. |
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@bjodah I had the |
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The reason for the broken in-place behaviour reported in #254 and #258 is that with NumPy 1.x,
super().__imul__(other)callsself.__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 reconstructcontext, 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: