CLN: pre-empt NotImplementedErorr in _aggregate_multiple_funcs (#29582)

Author: jbrockmendel

pandas/core/groupby/generic.py

@@ -888,6 +888,11 @@ def aggregate(self, func=None, *args, **kwargs):
                 return self._python_agg_general(func, *args, **kwargs)
             elif args or kwargs:
                 result = self._aggregate_frame(func, *args, **kwargs)
+
+            elif self.axis == 1:
+                # _aggregate_multiple_funcs does not allow self.axis == 1
+                result = self._aggregate_frame(func)
+
             else:
 
                 # try to treat as if we are passing a list
@@ -901,17 +906,11 @@ def aggregate(self, func=None, *args, **kwargs):
                         raise
                     result = self._aggregate_frame(func)
                 except NotImplementedError as err:
-                    if "axis other than 0 is not supported" in str(err):
-                        # raised directly by _aggregate_multiple_funcs
-                        pass
-                    elif "decimal does not support skipna=True" in str(err):
+                    if "decimal does not support skipna=True" in str(err):
                         # FIXME: kludge for DecimalArray tests
                         pass
                     else:
                         raise
-                    # FIXME: this is raised in a bunch of
-                    #  test_whitelist.test_regression_whitelist_methods tests,
-                    #  can be avoided
                     result = self._aggregate_frame(func)
                 else:
                     result.columns = Index(