(self)
return self._data
Return data, load if necessary
Return data, load if necessary
Return data load if necessary
def data(self) -> (pd.DataFrame, pd.Series, pd.DataFrame, pd.Series):
        """Return data, load if necessary"""
        if self._data is None:
            self.load()
        return self._data
def data ( self ) -> ( pd . DataFrame , pd . Series , pd . DataFrame , pd . Series ) : if self . _data is None : self . load ( ) return self . _data