[Cython] Fix deprecation warning in NumPy 1.20

bryanwweber · speth · commit 185aa977af11 · 2021-02-03T11:55:42.000-05:00
NumPy 1.20 deprecates numpy namespace aliases to built-in types, such as int, float, and object. Explicit specification of the precision with float64 is still supported and does not need to be changed. See: https://github.com/numpy/numpy/releases/tag/v1.20.0 and numpy/numpy#14882
diff --git a/interfaces/cython/cantera/composite.py b/interfaces/cython/cantera/composite.py
@@ -540,10 +540,10 @@ def __init__(self, phase, shape=(0,), states=None, extra=None, meta=None):
                 elif (self._shape[0] == 1
                       or np.array(v).shape[:len(self._shape)] == self._shape):
                     arr = np.array(v)
-                    if arr.dtype == np.object:
+                    if arr.dtype == object:
                         raise ValueError(
                             "Unable to create extra column '{}': data type "
-                            "'np.object' is not supported.".format(name))
+                            "'object' is not supported.".format(name))
                     if self._shape[0] == 1 and len(arr) > 1:
                         arr = arr[np.newaxis, :]
                     self._extra[name] = arr
diff --git a/interfaces/cython/cantera/test/test_thermo.py b/interfaces/cython/cantera/test/test_thermo.py
@@ -1787,7 +1787,7 @@ def test_extra_not_string(self):
 
     def test_extra_no_objects(self):
         with self.assertRaisesRegex(ValueError, "not supported"):
-            prop = np.array([0, [1, 2], (3, 4)], dtype=np.object)
+            prop = np.array([0, [1, 2], (3, 4)], dtype=object)
             states = ct.SolutionArray(self.gas, 3, extra={"prop": prop})
 
     def test_extra_reserved_names(self):
