openpyxl操作excel，excel本身是一个对象，每个sheet也都是一个对象。在创建一个excel的时候默认会产生一个Sheet，如何获取这个默认Sheet对象呢？看官网说明

　　A workbook is always created with at least one worksheet. You can get it by using theWorkbook.activeproperty:

	　　ws = wb.active

　　openpyxl创建excel后，通过wb.active属性即可返回该sheet对象。

　　那么创建多个sheet后如何获取其他sheet对象呢？看官网说明

　　     Once you gave a worksheet a name, you can get it as a key of the workbook
     　　You can loop through worksheets

　　1、可以通过sheet名字获取指定sheet对象

　　2、可以直接循环wb对象依次获取所有sheet对象

　　获取sheet对象的代码如下：

# -*- coding: utf-8 -*-
from openpyxl import Workbook

wb = Workbook() # 默认生成一个名为Sheet的sheet
ws = wb.active
print('默认sheet',ws)

for name in ['a','b']:
    wb.create_sheet(name)

# 获取sheet对象
for sheet in wb:
    print('sheet:',sheet)

# 通过sheet名获取
sheet_names = wb.sheetnames
for sheet_name in sheet_names:
    ws = wb[sheet_name]
    print('ws:',ws)


wb.save('test.xlsx')

D:python3installpython.exe D:/pyscript/py3script/python66/test2/test.py
默认sheet <Worksheet "Sheet">
sheet: <Worksheet "Sheet">
sheet: <Worksheet "a">
sheet: <Worksheet "b">
ws: <Worksheet "Sheet">
ws: <Worksheet "a">
ws: <Worksheet "b">

Process finished with exit code 0

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