python xlrd 모듈로 excel 파일 읽기

import xlrd
from xlutils.copy import copy

class ExcelUtil(object):

    def __init__(self, excel_path=None, index=None):
        if excel_path == None:
            excel_path = r"D:\PycharmProjects\2020study\config\keyword.xls"
        if index == None:
            index = 0
        self.data = xlrd.open_workbook(excel_path)
        self.table = self.data.sheets()[index]
        #  
        # self.rows = self.table.nrows
        #[[],[],[]]

    #  excel lisit 
    def get_data(self):
        result = []
        rows = self.get_lines()
        if rows !=None:
            for i in range(rows):
                col = self.table.row_values(i)
                result.append(col)
            return result
        return None

    #  
    def get_lines(self):
        rows = self.table.nrows
        if rows >= 1:
            return rows
        return None

    #  
    def get_col_value(self, row, cell):
        if self.get_lines() > row:
            data = self.table.cell(row, cell).value
            return data
        return None


    #  
    def write_value(self, row, value):
        read_value = self.data
        write_data = copy(read_value)
        write_data.get_sheet(0).write(row, 6, value)
        write_data.save(r"D:\PycharmProjects\2020study\config\keyword.xls")


if __name__ == '__main__':
    ec = ExcelUtil()
    print(ec.get_data())
    print(ec.get_col_value(3, 2))
    print(ec.write_value(6, "test"))