问带pika的ProbableAuthenticationError

EN

#!/usr/bin/env python
import pika

connection = pika.BlockingConnection(pika.ConnectionParameters(
    host='localhost'))
channel = connection.channel()

channel.queue_declare(queue='hello')

channel.basic_publish(exchange='',
                      routing_key='hello',
                      body='Hello World!')

connection.close()

Traceback (most recent call last):
  File "/home/pi/python_2_7_pika_test.py", line 4, in <module>
    connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/blocking_connection.py", line 130, in __init__
    super(BlockingConnection, self).__init__(parameters, None, False)
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/base_connection.py", line 72, in __init__
    on_close_callback)
  File "/usr/local/lib/python2.7/dist-packages/pika/connection.py", line 600, in __init__
    self.connect()
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/blocking_connection.py", line 230, in connect
    error = self._adapter_connect()
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/blocking_connection.py", line 309, in _adapter_connect
    self.process_data_events()
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/blocking_connection.py", line 240, in process_data_events
    if self._handle_read():
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/blocking_connection.py", line 348, in _handle_read
    super(BlockingConnection, self)._handle_read()
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/base_connection.py", line 343, in _handle_read
    return self._handle_error(error)
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/base_connection.py", line 302, in _handle_error
    self._handle_disconnect()
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/base_connection.py", line 248, in _handle_disconnect
    self._adapter_disconnect()
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/blocking_connection.py", line 318, in _adapter_disconnect
    self._check_state_on_disconnect()
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/blocking_connection.py", line 368, in _check_state_on_disconnect
    super(BlockingConnection, self)._check_state_on_disconnect()
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/base_connection.py", line 153, in _check_state_on_disconnect
    raise exceptions.ProbableAuthenticationError
ProbableAuthenticationError