Pre-commit fix

Author: snitish

pandas/core/window/ewm.py

@@ -981,7 +981,7 @@ def reset(self) -> None:
         """
         self._mean.reset()
 
-    def aggregate(self, func, *args, **kwargs):
+    def aggregate(self, func=None, *args, **kwargs):
         raise NotImplementedError("aggregate is not implemented.")
 
     def std(self, bias: bool = False, *args, **kwargs):

pandas/core/window/rolling.py

@@ -653,7 +653,7 @@ def aggregate(self, func=None, *args, **kwargs):
         relabeling, func, columns, order = reconstruct_func(func, **kwargs)
         result = ResamplerWindowApply(self, func, args=args, kwargs=kwargs).agg()
         if result is not None:
-            if relabeling:
+            if isinstance(result, ABCDataFrame) and relabeling:
                 result = result.iloc[:, order]
                 result.columns = columns
         else:
@@ -1247,7 +1247,7 @@ def calc(x):
         klass="Series/DataFrame",
         axis="",
     )
-    def aggregate(self, func, *args, **kwargs):
+    def aggregate(self, func=None, *args, **kwargs):
         result = ResamplerWindowApply(self, func, args=args, kwargs=kwargs).agg()
         if result is None:
             # these must apply directly