how to upload files using python with api ?

[youssef mahmoud]

hi 

every time i try to upload files with python i got 

400 error or 404 tool not found , i don't know where what is issue with my code 

headers_a = {"X-Api-Key": assemblla_apikey, "X-Api-Secret": assemblla_apisecret,'Content-Type': 'multipart/form-data'}

attachment_url= 'https://api.assembla.com/v1/spaces/$assemblla_spacename/documents.json'

attachment_file =  BytesIO(requests.get('http://127.0.0.1:8000'+attachment.attachment.url).content)

attachemnt_mimetype = magic.from_buffer(attachment_file.read(2048),mime=True)

 files = {'document[file]': (attachment_file.getvalue()),'document[attachable_type]':'Ticket','document[name]':attachment.attachment_name, 'document[attachable_id]':ticket_id}

attachment_reponse = requests.post(attachment_url, files=files, headers=headers_a)