Subset rows or columns based on their labels

        Args:
            items (list): list of labels to subset
            like (string): retain labels where `arg in label == True`
            regex (string): retain labels matching regex input
            axis: axis to filter on

        Returns:
            A new DataFrame with the filter applied.

def filter(self, items=None, like=None, regex=None, axis=None):
        """Subset rows or columns based on their labels

        Args:
            items (list): list of labels to subset
            like (string): retain labels where `arg in label == True`
            regex (string): retain labels matching regex input
            axis: axis to filter on

        Returns:
            A new DataFrame with the filter applied.
        """
        nkw = count_not_none(items, like, regex)
        if nkw > 1:
            raise TypeError(
                "Keyword arguments `items`, `like`, or `regex` are mutually exclusive"
            )
        if nkw == 0:
            raise TypeError("Must pass either `items`, `like`, or `regex`")
        if axis is None:
            axis = "columns"  # This is the default info axis for dataframes

        axis = self._get_axis_number(axis)
        labels = self.columns if axis else self.index

        if items is not None:
            bool_arr = labels.isin(items)
        elif like is not None:

            def f(x):
                return like in to_str(x)

            bool_arr = labels.map(f).tolist()
        else:

            def f(x):
                return matcher.search(to_str(x)) is not None

            matcher = re.compile(regex)
            bool_arr = labels.map(f).tolist()
        if not axis:
            return self[bool_arr]
        return self[self.columns[bool_arr]]