nit

Author: hmaarrfk

xarray/core/variable.py

@@ -269,8 +269,7 @@ def as_compatible_data(
 
     Finally, wrap it up with an adapter if necessary.
     """
-    ndim = getattr(data, "ndim", None)
-    if fastpath and ndim is not None:
+    if fastpath and getattr(data, "ndim", None) is not None:
         return cast("T_DuckArray", data)
 
     from xarray.core.dataarray import DataArray