@staticmethod
def remove_digits(df, column):
    """
        Clean text, remove digits

        Parameters
        ----------
        df : DataFrame
            The df to perform case operation on
        column : string, int
            The column on which the operation has to be performed
        Returns
        -------
        List
        """
    return df[column].apply(lambda x: ' '.join([x for x in x.split() if not
        x.isdigit()])).values.tolist()
