Merge pull request matplotlib#29616 from timhoffm/fix-units

FIX: Fix unit example so that we can unpin numpy<2.1

Author: story645

.circleci/config.yml

@@ -98,7 +98,7 @@ commands:
     parameters:
       numpy_version:
         type: string
-        default: "~=2.0.0"
+        default: ""
     steps:
       - run:
           name: Install Python dependencies

environment.yml

@@ -18,7 +18,7 @@ dependencies:
   - kiwisolver>=1.3.1
   - pybind11>=2.13.2
   - meson-python>=0.13.1
-  - numpy<2.1
+  - numpy
   - pillow>=9
   - pkg-config
   - pygobject

galleries/examples/units/basic_units.py

@@ -193,6 +193,11 @@ def get_unit(self):
 
 
 class BasicUnit:
+    # numpy scalars convert eager and np.float64(2) * BasicUnit('cm')
+    # would thus return a numpy scalar. To avoid this, we increase the
+    # priority of the BasicUnit.
+    __array_priority__ = np.float64(0).__array_priority__ + 1
+
     def __init__(self, name, fullname=None):
         self.name = name
         if fullname is None: