Python Requests - Sending POST form data multi-part - python-2.7

Question

I've looked through the posts here, and I haven't found a solution yet.
I'm trying to send a POST request to send a file to a server.
Part of the form data accepts the binary file, and there are other mandatory fields to add to the form.
The last solution I've tried was this:
my_data = {
"repo_upload_file": ("filename.pdf", open("filename.pdf", rb), "application/pdf"),
"sesskey": (None, sess_key),
"repo_id": (None, repo_id),
"author": (None, author),
"savepath": (None, save_path),
"title": (None, title),
"itemid": (None, itemid),
"ctx_id": (None, ctx_id)
}
response = session.post("http://mywebsite/repo.php?action=upload", files=my_data)
print response.content # expecting a json object that stores the url to the uploaded file
When I try via my browser (this server has a ui), it works fine. Using fiddler, I've seen that the fields get sent as WebForms :
However, when using my code, it appears on fiddler that somehow the server doesn't recognize them as WebForms, even though it appears that the request was sent correctly
This is how the server expects them, but for some reason this doesn't seem to be working
When I got it working fine from the browser, this was the request form datas:

Answer 1

If you desire to post other data which is not file, you should follow one of those
my_data = {
"repo_upload_file": ("filename.pdf", open("filename.pdf", "rb"), "application/pdf")
}
data = {
"sesskey": sess_key,
"repo_id": repo_id,
"author": author,
"savepath": save_path,
"title": title,
"itemid": itemid,
"ctx_id": ctx_id
}
Type 1, post data normally
response = session.post(url, data = data , files=my_data)
Type 2, post as json
response = session.post(url, json = data , files=my_data)