[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

xarray/core/formatting.py

@@ -783,7 +783,9 @@ def extra_items_repr(extra_keys, mapping, ab_side, kwargs):
         try:
             # compare xarray variable
             if not callable(compat):
-                compatible = getattr(a_mapping[k].variable, compat)(b_mapping[k].variable)
+                compatible = getattr(a_mapping[k].variable, compat)(
+                    b_mapping[k].variable
+                )
             else:
                 compatible = compat(a_mapping[k].variable, b_mapping[k].variable)
             is_variable = True