docs: def get_database_size(db_user, db_name, localhost=False):
      """
      Returns the total size for the given database role and name.
  
      :param db_user: String representing the database role.
      :param db_name: String representing the database name.
  
      """
      localhost_part = ''
      if localhost:
          localhost_part = '-h localhost '
      cmd = 'psql {0}-U {1} -c "select pg_database_size(\'{2}\');"'.format(
          localhost_part, db_user, db_name)
      total = getoutput(cmd).split()[2]
      return int(total)