def login():
   u = "myusername"
   p = "mypassword"
   url = "https://api.robinhood.com/api-token-auth/"
   data = {"username": u, "password": p}
   r = requests.post(url, json=data)
   return r.text

print login()

import requests

def login():
    username = 'username'
    password = 'password'
    header = {"Accept": "application/json"}
    data = {"client_id": "c82SH0WZOsabOXGP2sxqcj34FxkvfnWRZBKlBjFS",
            "expires_in": 86400,
            "grant_type": "password",
            "password": "pword",
            "scope": "internal",
            "username": "uname"}

    url = "https://api.robinhood.com/oauth2/token/"
    r = requests.post(url, data=data, headers=header)
    return r.text

print(login())