在现有的 Excel 工作表上保存 Pandas 系列

Question

I am trying to export some values from python to excel. In the first part I want to setup the sheet and save it in a xlsx file. After that I want to overwrite the same worksheet by adding a pandas series.

My issue comes from the fact that when I run my code, I obtain a brand new worksheet with the name 'Name1' instead instead of putting the Series on the existing sheet named "Name" previously.

import pandas as pd
from openpyxl import Workbook
from openpyxl import load_workbook

#Page setup
wb = Workbook()
ws0 = wb.active
ws0.title = "Name"
ws0.sheet_properties.tabColor = "1072BA"
ws0['B1'] = "AAA"
wb.save('Example.xlsx')
wb.close()

#Insert pandas series on existing worksheet
path = r".\Example.xlsx"
book = load_workbook('Example.xlsx')
writer = pd.ExcelWriter(path, engine = 'openpyxl')
writer.book = book

r1y = pd.Series([1,3,5,13,6,8])
df1y = pd.DataFrame(r1y)

df1y.to_excel(writer, 'Name', header=False, startcol = 0, startrow = 1)
writer.save()
writer.close()

What am I doing wrong?

Thanks in advance

Answer 1

Obviously to_excel creates a new worksheet and does not want to write in an already created one. You are already having one, which is called Name , thus the new one is Name1 . If you do not have a sheet MyOwnName this will crete one and write the data there:

df1y.to_excel(writer, 'MyOwnName', header=False, startcol = 0, startrow = 1)

Although I could not find anything mentioning it in the documentation: https://pandas.pydata.org/pandas- docs/stable/generated/pandas.DataFrame.to_excel.html

Answer 2

I have found the answer to this problem in a different website, which I report here. I have not come up with this answer myself, so I want to credit who did: https://cmsdk.com/python/insert-pandas-dataframe-into-existing-excel-worksheet-with-styling.html

from openpyxl import load_workbook, Workbook
import pandas as pd
df = pd.DataFrame(data=["20-01-2018",4,9,16,25,36])
path = 'filepath.xlsx'
writer = pd.ExcelWriter(path, engine='openpyxl')
writer.book = load_workbook(path)
**writer.sheets = dict((ws.title,ws) for ws in writer.book.worksheets)**
df.to_excel(writer,sheet_name="Sheet1", startrow=2,index=False, header=False)
writer.save()

What did the job for me was the row highlighted in bold. I hope it can be of help to you!