Python Requests Giving Me Missing Metadata When Trying To Upload Attachment

I am trying to upload an attachment via an API. I can make it work in the software's Swagger environment with this:

curl -X 'POST' \
  'https://demo.citywidesolutions.com/v4_server/external/v1/maintenance/service_requests/9/attached_files' \
  -H 'accept: */*' \
  -H 'Content-Type: multipart/form-data' \
  -H 'Authorization: Bearer 123456789' \
  -F 'description=' \
  -F 'data=@This is my file.pdf;type=application/pdf'

When I try to do the same with python requests I get a 400 error with a message of missing metadata. Here is what I am trying to pass with Python:

import requests
Headers = {'accept': '*/*', 'Content-Type': 'multipart/form-data', 'Authorization': 'Bearer 123456789'}
Attachment = {'description': '', 'data': open('C:/This is my file.pdf', 'rb')}
Response = requests.post(url='https://demo.citywidesolutions.com/v4_server/external/v1/maintenance/service_requests/9/attached_files', headers=Headers, files=Attachment)

From that I get a 400 response and the JSON says Missing Metadata. What am I missing here?

You could try explicitly setting the file type in your code; you do so in the curl method, but not in the Python script.

Also, the requests library is able to handle 'Content-Type', so typically you don't need to set it. And the description parameter may be expected as a tuple. Here are all those changes; I have not tested since I do not have access to the endpoint:

import requests

headers = {
    'accept': '*/*',
    'Authorization': 'Bearer 123456789'
} # excluded content-type

files = {
    'description': (None, ''),
    'data': ('blank.pdf', open('blank.pdf', 'rb'), 'application/pdf') #added application/pdf format
}

url = 'https://demo.citywidesolutions.com/v4_server/external/v1/maintenance/service_requests/9/attached_files'

response = requests.post(url, headers=headers, files=files)