情境：讀取Excel自動處理時，往往會在資料後面加一個處理標識，記錄以處理資料與未處理資料

import xlrd
import xlwt

def read_excel(fname,sheetname):
    book = xlrd.open_workbook(fname)
    sheet = book.sheet_by_name(sheetname)
    # 獲取行數
    nrows = sheet.nrows
    row_list = []
    # 獲取各行資料
    for i in range(1, nrows):
        row_data = sheet.row_values(i)
        row_list.append(row_data)
    return row_list

def write_excel(datas,filename):
    book = xlwt.Workbook()
    sheet1 = book.add_sheet('Sheet1')
    for x,data in enumerate(datas):
        print(data)
        for y,param in enumerate(data):
            if y == 2:
                sheet1.write(x,y,'True')
            else:
                sheet1.write(x,y,param)
    book.save(filename)

print(read_excel('demo.xls','Sheet1'))
datas = read_excel('demo.xls','Sheet1')
 

from xlutils.copy import copy

def write_exist_excel(filename,sheetname):
    #讀取舊Excel中的資訊
    exist_excel = xlrd.open_workbook(filename)
    sheet = exist_excel.sheet_by_name(sheetname)
    nrows = sheet.nrows

    #複製已存在的Excel
    new_excel = copy(exist_excel)
    new_sheet = new_excel.get_sheet(sheetname)

    for i in range(1,nrows):
        row_data = sheet.row_values(i)
        print(row_data)
        # 在新的Excel中寫入
        new_sheet.write(i,2,'True')
    new_excel.save(filename)

write_exist_excel('demo.xls','Sheet1')