如何在不覆盖数据的情况下(using pandas)写入现有的excel文件？

Question

我使用pandas以以下方式写入excel文件：

import pandas

writer = pandas.ExcelWriter('Masterfile.xlsx') 

data_filtered.to_excel(writer, "Main", cols=['Diff1', 'Diff2'])

writer.save()

Masterfile.xlsx已经包含许多不同的选项卡。但是，它尚未包含“ Main”。

熊猫正确地写到“主要”表，不幸的是，它也删除了所有其他标签。

Answer 1

Pandas文档说，它对xlsx文件使用openpyxl。快速浏览一下其中的代码ExcelWriter可以提示可能会发生以下情况：

import pandas
from openpyxl import load_workbook

book = load_workbook('Masterfile.xlsx')
writer = pandas.ExcelWriter('Masterfile.xlsx', engine='openpyxl') 
writer.book = book

## ExcelWriter for some reason uses writer.sheets to access the sheet.
## If you leave it empty it will not know that sheet Main is already there
## and will create a new sheet.

writer.sheets = dict((ws.title, ws) for ws in book.worksheets)

data_filtered.to_excel(writer, "Main", cols=['Diff1', 'Diff2'])

writer.save()