Apply ruff/flake8-simplify rule SIM401 (#9749)

SIM401 Use `.get()` instead of an `if` block

xarray/conventions.py

@@ -805,7 +805,7 @@ def cf_encoder(variables: T_Variables, attributes: T_Attrs):
 
     # Remove attrs from bounds variables (issue #2921)
     for var in new_vars.values():
-        bounds = var.attrs["bounds"] if "bounds" in var.attrs else None
+        bounds = var.attrs.get("bounds")
         if bounds and bounds in new_vars:
             # see http://cfconventions.org/cf-conventions/cf-conventions.html#cell-boundaries
             for attr in [

xarray/core/parallel.py

@@ -600,7 +600,7 @@ def _wrapper(
             # unchunked dimensions in the input have one chunk in the result
             # output can have new dimensions with exactly one chunk
             key: tuple[Any, ...] = (gname_l,) + tuple(
-                chunk_index[dim] if dim in chunk_index else 0 for dim in variable.dims
+                chunk_index.get(dim, 0) for dim in variable.dims
             )
 
             # We're adding multiple new layers to the graph:

xarray/core/variable.py

@@ -1147,10 +1147,10 @@ def _pad_options_dim_to_index(
 
         if fill_with_shape:
             return [
-                (n, n) if d not in pad_option else pad_option[d]
+                pad_option.get(d, (n, n))
                 for d, n in zip(self.dims, self.data.shape, strict=True)
             ]
-        return [(0, 0) if d not in pad_option else pad_option[d] for d in self.dims]
+        return [pad_option.get(d, (0, 0)) for d in self.dims]
 
     def pad(
         self,