Compute median of groups, excluding missing values.

        For multiple groupings, the result index will be a MultiIndex

def median(self, **kwargs):
        """
        Compute median of groups, excluding missing values.

        For multiple groupings, the result index will be a MultiIndex
        """
        try:
            return self._cython_agg_general('median', **kwargs)
        except GroupByError:
            raise
        except Exception:  # pragma: no cover

            def f(x):
                if isinstance(x, np.ndarray):
                    x = Series(x)
                return x.median(axis=self.axis, **kwargs)
            with _group_selection_context(self):
                return self._python_agg_general(f)