将excel从sharepoint读取到python时出现ValueError

Question

I am trying to read an excel file from sharepoint to python.

Q1: There are two URLs for the file. If I directly copy the link of the file, I get:

https://company.sharepoint.com/:x:/s/project/letters-numbers?e=lettersnumbers

If I click into folders from the webpage one after another, until I click and open the excel file, the URL now is:

https://company.sharepoint.com/:x:/r/sites/project/_layouts/15/Doc.aspx?sourcedoc=letters-numbers&file=Table.xlsx&action=default&mobileredirect=true

Which one should I use?

Q2: My code below:

import pandas as pd
from office365.runtime.auth.authentication_context import AuthenticationContext
from office365.sharepoint.client_context import ClientContext
from office365.sharepoint.files.file import File

URL = "https://company.sharepoint.com/:x:/s/project/letters-numbers?e=lettersnumbers"
USERNAME = "abc@a.com"
PASSWORD = "abcd"

ctx_auth = AuthenticationContext(URL)
if ctx_auth.acquire_token_for_user(USERNAME, PASSWORD):
    ctx = ClientContext(URL, ctx_auth)
    web = ctx.web
    ctx.load(web)
    ctx.execute_query()
    print("Authentication successful")
else:
    print(ctx_auth.get_last_error())

response = File.open_binary(ctx, URL)
bytes_file_obj = io.BytesIO()
bytes_file_obj.write(response.content)
bytes_file_obj.seek(0)
df = pd.read_excel(bytes_file_obj, sheet_name="Sheet2")

It works until the pd.read_excel() , where I get ValueError.

ValueError: Excel file format cannot be determined, you must specify an engine manually.

I don't know where it went wrong and if there will be further problems with loading. It will be highly appreciated if someone could warn me of the problems or leave an example.

Answer 1

If you take a look at the pandas documentation for 'read_excel' ( https://pandas.pydata.org/docs/reference/api/pandas.read_excel.html ), you'll see that there is an 'engine' parameter.

Try the different options and see which one works, since your error is saying that an engine has to be specified manually.

If this is correct, in the future, take the error messages literally and check the documentation

Answer 2

I have tried different URLs (and how to obtain them), and received different binary files. They are either a line of code status (like 403) or warning, or something that looks like a header. So I believe the problem is the URL format.

Here (github.com/vgrem) I found the answer.

It basically says that for ClientContext you need an absolute URL,

URL = "https://company.sharepoint.com/:x:/r/sites/project"

And for File you need a relative path, but with overlap with the URL:

RELATIVE_PATH = "/sites/project/Shared%20Documents/Folder/Table.xlsx"

The RELATIVE_PATH can be found like this:

1. Go to the folder of the file in Teams (or on the webpage).

2. Choose the file, Open in app (Excel).

3. In Excel, File -> Property , copy the path and adapt to the above format .

4. Replace Space with "%20" .

ctx_auth = AuthenticationContext(URL)
if ctx_auth.acquire_token_for_user(USERNAME, PASSWORD):
    ctx = ClientContext(URL, ctx_auth)
    web = ctx.web
    ctx.load(web)
    ctx.execute_query()
    print("Authentication successful")
else:
    print(ctx_auth.get_last_error())

response = File.open_binary(ctx, RELATIVE_PATH)
bytes_file_obj = io.BytesIO()
bytes_file_obj.write(response.content)
bytes_file_obj.seek(0)
df = pd.read_excel(bytes_file_obj, sheet_name='Sheet2')

If the sheet_name is not specified and the original .xlsx has multiple sheets, the pd.read_excel() will generate warnings and the df here is actually a dict .