def __getitem__(self, dataframe_name):
        """Get dataframe instance from entityset

        Args:
            dataframe_name (str): Name of dataframe.

        Returns:
            :class:`.DataFrame` : Instance of dataframe with Woodwork typing information. None if dataframe doesn't
                exist on the entityset.
        """
        if dataframe_name in self.dataframe_dict:
            return self.dataframe_dict[dataframe_name]
        name = self.id or "entity set"
        raise KeyError("DataFrame %s does not exist in %s" % (dataframe_name, name))
Get dataframe instance from entityset

        Args:
            dataframe_name (str): Name of dataframe.

        Returns:
            :class:`.DataFrame` : Instance of dataframe with Woodwork typing information. None if dataframe doesn't
                exist on the entityset.
        
featuretools/entityset/entityset.py