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So I am trying to write a Python script that will be able to update a list item in company's SharePoint (intranet), and for some reason in the script when I do the "post request" (for updating item) it results in a 401 unauthorized error. I am using HttpNtlmAuth and I think the credential is good as there is no problem for me to do the get request and look up list items. I would like to have some helps or insights. The following is part of my codes:

# the credential
auth=HttpNtlmAuth("user", "password")
# -------------- get request --------------
# the headers for get request
headers_get = {'accept': 'application/json;odata=verbose'}
# no problem for this one
response_get = requests.get(sharepoint_url+"lists/GetByTitle('%s')" % sharepoint_listname, auth=auth, headers=headers_get)

# -------------- post request --------------

# specify the link of that item I want to update
api_page = sharepoint_url + "lists/GetByTitle('%s')/GetItemById(%d)" % (sharepoint_listname, item_id)

# the headers for post request
headers_post = {
"Accept":"application/json",
"Content-Type":"application/json; odata=verbose",
"odata":"verbose",
"X-RequestForceAuthentication": "true",
"X-RequestDigest" : form_digest_value, # should be good
"IF-MATCH": etag, # should be good
"X-HTTP-Method" : "MERGE"
}

# data sent to update; which should be good 
# as if I modify it 400 error will occur rather than 401 any more
data = json.dumps({'__metadata': { 'type': 'ListItemEntityTypeFullName' }, 'some column': 'the updated value'})

# Here 401 error encountered
response_post = requests.post(api_page, data, auth=auth, headers=headers_post)

After doing some researches I think probably the reason is I didn't have Authorization: "Bearer " + accessToken in my headers, as in Microsoft's documentation this is included. However, I also checked other blogs and it seems this token thing doesn't matter. For example: this and this.

Any help, idea or insight would be appreciated. Thank you very much!

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