Multiple imports for an import name (#2504)

Author: DimitriPapadopoulos

tests/test_indexing.py

@@ -12,7 +12,7 @@
 
 import zarr
 from zarr import Array
-from zarr.core.buffer import BufferPrototype, default_buffer_prototype
+from zarr.core.buffer import default_buffer_prototype
 from zarr.core.indexing import (
     BasicSelection,
     CoordinateSelection,