BUG: fix suppressed TypeErrors in Groupby.mean, median, var (#41292)

Author: jbrockmendel

pandas/core/groupby/groupby.py

@@ -1563,7 +1563,7 @@ def mean(self, numeric_only: bool = True):
         """
         result = self._cython_agg_general(
             "mean",
-            alt=lambda x, axis: Series(x).mean(numeric_only=numeric_only),
+            alt=lambda x: Series(x).mean(numeric_only=numeric_only),
             numeric_only=numeric_only,
         )
         return result.__finalize__(self.obj, method="groupby")
@@ -1590,7 +1590,7 @@ def median(self, numeric_only=True):
         """
         result = self._cython_agg_general(
             "median",
-            alt=lambda x, axis: Series(x).median(axis=axis, numeric_only=numeric_only),
+            alt=lambda x: Series(x).median(numeric_only=numeric_only),
             numeric_only=numeric_only,
         )
         return result.__finalize__(self.obj, method="groupby")
@@ -1646,7 +1646,7 @@ def var(self, ddof: int = 1):
         """
         if ddof == 1:
             return self._cython_agg_general(
-                "var", alt=lambda x, axis: Series(x).var(ddof=ddof)
+                "var", alt=lambda x: Series(x).var(ddof=ddof)
             )
         else:
             func = lambda x: x.var(ddof=ddof)