5. Access .ndim only once

Author: dcherian

xarray/core/missing.py

@@ -687,21 +687,22 @@ def interp_func(var, x, new_x, method, kwargs):
     if is_duck_dask_array(var):
         import dask.array as da
 
-        nconst = var.ndim - len(x)
+        ndim = var.ndim
+        nconst = ndim - len(x)
 
-        out_ind = list(range(nconst)) + list(range(var.ndim, var.ndim + new_x[0].ndim))
+        out_ind = list(range(nconst)) + list(range(ndim, ndim + new_x[0].ndim))
 
         # blockwise args format
         x_arginds = [[_x, (nconst + index,)] for index, _x in enumerate(x)]
         x_arginds = [item for pair in x_arginds for item in pair]
         new_x_arginds = [
-            [_x, [var.ndim + index for index in range(_x.ndim)]] for _x in new_x
+            [_x, [ndim + index for index in range(_x.ndim)]] for _x in new_x
         ]
         new_x_arginds = [item for pair in new_x_arginds for item in pair]
 
         args = (
             var,
-            range(var.ndim),
+            range(ndim),
             *x_arginds,
             *new_x_arginds,
         )
@@ -713,7 +714,7 @@ def interp_func(var, x, new_x, method, kwargs):
         new_x = rechunked[1 + (len(rechunked) - 1) // 2 :]
 
         new_axes = {
-            var.ndim + i: new_x[0].chunks[i]
+            ndim + i: new_x[0].chunks[i]
             if new_x[0].chunks is not None
             else new_x[0].shape[i]
             for i in range(new_x[0].ndim)