def __init__(self, sep = ' '):
        """
        @type  sep: str
        @param sep: Separator between cells in each row.
        """
        self.__cols  = list()
        self.__width = list()
        self.__sep   = sep
def __init__ ( self , sep = ' ' ) : self . __cols = list ( ) self . __width = list ( ) self . __sep = sep
@type  sep: str
        @param sep: Separator between cells in each row.