old_contents: from pymemcache.client.hash import HashClient
  from pymemcache.serde import (
      python_memcache_deserializer as default_deserializer,
      python_memcache_serializer as default_serializer,
  )
  
  
  def _split_host_and_port(servers):
      """Convert python-memcached based server strings to pymemcache's one.
  
      - python-memcached: ['127.0.0.1:11211', ...] or ['127.0.0.1', ...]
      - pymemcache: [('127.0.0.1', 11211), ...]
      """
      _host_and_port_list = []
      for server in servers:
          connection_info = server.split(':')
          if len(connection_info) == 1:
              _host_and_port_list.append(
                  (connection_info[0], 11211))
          elif len(connection_info) == 2:
              _host_and_port_list.append(
                  (connection_info[0], int(connection_info[1])))
      return _host_and_port_list
  
  
  class Client(HashClient):
      """pymemcache client.
  
      Customize pymemcache behavior as python-memcached (default backend)'s one.
      """
  
      def __init__(self, servers, *args, **kwargs):
          kwargs.update(
              serializer=kwargs.get('serializer', default_serializer),
              deserializer=kwargs.get('deserializer', default_deserializer)
          )
  
          super(Client, self).__init__(
              _split_host_and_port(servers),
              *args,
              **kwargs
          )
  
      def disconnect_all(self):
          for client in self.clients.values():
              client.close()
  
      def get_many(self, keys, gets=False, *args, **kwargs):
          # pymemcache's HashClient may returns {'key': False}
          end = super(Client, self).get_many(keys, gets, *args, **kwargs)
  
          return {key: end.get(key) for key in end if end.get(key)}
  
      get_multi = get_many
  
new_contents: from pymemcache.client.hash import HashClient
  from pymemcache.serde import (
      python_memcache_deserializer,
      python_memcache_serializer,
  )
  
  
  def _split_host_and_port(servers):
      """Convert python-memcached based server strings to pymemcache's one.
  
      - python-memcached: ['127.0.0.1:11211', ...] or ['127.0.0.1', ...]
      - pymemcache: [('127.0.0.1', 11211), ...]
      """
      _host_and_port_list = []
      for server in servers:
          connection_info = server.split(':')
          if len(connection_info) == 1:
              _host_and_port_list.append(
                  (connection_info[0], 11211))
          elif len(connection_info) == 2:
              _host_and_port_list.append(
                  (connection_info[0], int(connection_info[1])))
      return _host_and_port_list
  
  
  class Client(HashClient):
      """pymemcache client.
  
      Customize pymemcache behavior as python-memcached (default backend)'s one.
      """
  
      def __init__(self, servers, *args, **kwargs):
          kwargs.update(
              serializer=kwargs.get('serializer', python_memcache_serializer),
              deserializer=kwargs.get('deserializer',
                                      python_memcache_deserializer)
          )
  
          super(Client, self).__init__(
              _split_host_and_port(servers),
              *args,
              **kwargs
          )
  
      def disconnect_all(self):
          for client in self.clients.values():
              client.close()
  
      def get_many(self, keys, gets=False, *args, **kwargs):
          # pymemcache's HashClient may returns {'key': False}
          end = super(Client, self).get_many(keys, gets, *args, **kwargs)
  
          return {key: end.get(key) for key in end if end.get(key)}
  
      get_multi = get_many
  
subject: fix isort bugs