Make Python classes frozen (#111)

Author: kylebarron

python/src/kdtree/builder.rs

@@ -216,7 +216,7 @@ impl PyKDTreeInner {
     }
 }
 
-#[pyclass(name = "KDTree")]
+#[pyclass(name = "KDTree", frozen)]
 pub struct PyKDTree(PyKDTreeInner);
 
 #[pymethods]

python/src/kdtree/metadata.rs

@@ -33,7 +33,7 @@ impl PyKDTreeMetadataInner {
     }
 }
 
-#[pyclass(name = "KDTreeMetadata")]
+#[pyclass(name = "KDTreeMetadata", frozen)]
 pub struct PyKDTreeMetadata(PyKDTreeMetadataInner);
 
 #[pymethods]

python/src/rtree/builder.rs

@@ -334,7 +334,7 @@ enum PyRTreeInner {
     Float64(Arc<RTree<f64>>),
 }
 
-#[pyclass(name = "RTree")]
+#[pyclass(name = "RTree", frozen)]
 pub struct PyRTree(PyRTreeInner);
 
 impl PyRTreeInner {

python/src/rtree/metadata.rs

@@ -47,7 +47,7 @@ impl PyRTreeMetadataInner {
     }
 }
 
-#[pyclass(name = "RTreeMetadata")]
+#[pyclass(name = "RTreeMetadata", frozen)]
 pub struct PyRTreeMetadata(PyRTreeMetadataInner);
 
 #[pymethods]