python 抽象类

from abc import ABCMeta, abstractmethod
from openpyxl import load_workbook
import xlrd, xlwt


class ExcelHelper(metaclass=ABCMeta):

    @abstractmethod
    def read_row(self):
        pass

    @abstractmethod
    def read_column(self):
        pass


class DTSHelper:
    __metaclass__ = ABCMeta

    @abstractmethod
    def read(self):
        xlrd.book
        pass

    @abstractmethod
    def write(self):
        pass


class XLSHelper(ExcelHelper):

    def __init__(self, filename):
        self.__workbook = xlrd.open_workbook(filename)
        self.__worksheets = self.__workbook.sheets()
        self.__cur_sheet = self.__worksheets[0] if len(self.__worksheets) > 0 else None

    def use_sheet(self, sheet_name):
        self.__cur_sheet = self.__workbook.sheet_by_name(sheet_name)

    def new_sheet(self, sheet_name):
        self.__cur_sheet = xlwt.Workbook(self.__workbook, encoding='utf-8').add_sheet(sheet_name)  # 难道不能修改文件吗???

    def read_row(self):
        pass

    def read_column(self):
        pass

    def read_cell(self):
        pass


class XLSXHelper(ExcelHelper):

    def __init__(self, filename, readonly=True):
        self.__workbook = load_workbook(filename, readonly)
        self.__worksheets = self.__workbook.worksheets
        self.__cur_sheet = self.__worksheets[0] if len(self.__worksheets) > 0 else None

    def use_sheet(self, sheet_name):
        self.__cur_sheet = self.__workbook.get_sheet_by_name(sheet_name)

    def new_sheet(self, sheet_name):
        self.__cur_sheet = self.__workbook.create_sheet(title=sheet_name)

    def read_row(self):
        pass

    def read_column(self):
        pass

    def read_cell(self):
        pass


if __name__ == '__main__':
    pass