client = docker.from_env()
client.containers.run("ubuntu", "echo hello world")

/usr/local/lib/python2.7/site-packages/docker/models/containers.pyc in run(self, image, command, stdout, stderr, remove, **kwargs)
    653                                     detach=detach, **kwargs)
    654         except ImageNotFound:
--> 655             self.client.images.pull(image)
    656             container = self.create(image=image, command=command,
    657                                     detach=detach, **kwargs)

/usr/local/lib/python2.7/site-packages/docker/models/images.pyc in pull(self, name, **kwargs)
    254             >>> image = client.images.pull('busybox')
    255         """
--> 256         self.client.api.pull(name, **kwargs)
    257         return self.get(name)
    258 

/usr/local/lib/python2.7/site-packages/docker/api/image.pyc in pull(self, repository, tag, stream, insecure_registry, auth_config, decode)
    331         if utils.compare_version('1.5', self._version) >= 0:
    332             if auth_config is None:
--> 333                 header = auth.get_config_header(self, registry)
    334                 if header:
    335                     headers['X-Registry-Auth'] = header

AttributeError: 'module' object has no attribute 'get_config_header'