old_contents: """
  nydus.db.routers
  ~~~~~~~~~~~~~~~~
  
  :copyright: (c) 2011 DISQUS.
  :license: Apache License 2.0, see LICENSE for more details.
  """
  
  from .base import BaseRouter, RoundRobinRouter
  
new_contents: """
  nydus.db.routers
  ~~~~~~~~~~~~~~~~
  
  :copyright: (c) 2011 DISQUS.
  :license: Apache License 2.0, see LICENSE for more details.
  """
  
  from .base import BaseRouter, RoundRobinRouter, PartitionRouter
  
subject: Add partition router to base