add NumpyExtensionArray

Author: cmp0xff

pandas-stubs/_libs/arrays.pyi

@@ -0,0 +1 @@
+class NDArrayBacked: ...

pandas-stubs/core/arrays/_mixins.pyi

@@ -0,0 +1,5 @@
+from pandas.core.arrays.base import ExtensionArray
+
+from pandas._libs.arrays import NDArrayBacked
+
+class NDArrayBackedExtensionArray(NDArrayBacked, ExtensionArray): ...

pandas-stubs/core/arrays/numpy_.pyi

@@ -1,9 +1,12 @@
 import numpy as np
 from numpy.lib.mixins import NDArrayOperatorsMixin
+from pandas.core.arraylike import OpsMixin
+from pandas.core.arrays._mixins import NDArrayBackedExtensionArray
 from pandas.core.arrays.base import (
     ExtensionArray,
     ExtensionOpsMixin,
 )
+from pandas.core.strings.object_array import ObjectStringArrayMixin
 
 from pandas.core.dtypes.dtypes import ExtensionDtype
 
@@ -14,3 +17,6 @@ class PandasDtype(ExtensionDtype):
     def itemsize(self) -> int: ...
 
 class PandasArray(ExtensionArray, ExtensionOpsMixin, NDArrayOperatorsMixin): ...
+class NumpyExtensionArray(
+    OpsMixin, NDArrayBackedExtensionArray, ObjectStringArrayMixin
+): ...

pandas-stubs/core/strings/object_array.pyi

@@ -0,0 +1 @@
+class ObjectStringArrayMixin: ...