mailgunfile.py

# -*- coding: utf-8 -*-
import requests
request=requests.post(
    'https://api.mailgun.net/v2/samples.mailgun.org/messages',
    auth=("api", "key-3ax6xnjp29jd6fds4gc373sgvjxteol0"),
    files=[("attachment", open("test.jpg"))],
    data={"from":"foo@example.com",
          "to": "bar@example.com",
          "subject": "Hello",
          "text": "Testing some Mailgun awesomness!",
          "html": 'HTML version of the body'})

print 'Status: {0}'.format(request.status_code)
print 'Body:   {0}'.format(request.text)