in uber_rides/auth.py [0:0]
def _generate_state_token(self, length=32):
"""Generate CSRF State Token.
CSRF State Tokens are passed as a parameter in the authorization
URL and are checked when receiving responses from the Uber Auth
server to prevent request forgery.
"""
choices = ascii_letters + digits
return ''.join(SystemRandom().choice(choices) for _ in range(length))