old_contents: # -*- coding: utf-8 -*-
  
  """This class contains an alternate implemenation of the PyBEL database manager that only stores graphs
  in memory
  """
  
  from pybel.manager import Manager
  
  
  class _Namespace(object):
      pass
  
  
  class DictManager(Manager):
      """A dictionary-based implementation of the PyBEL Manager"""
  
      def __init__(self, connection=None):
          super(DictManager, self).__init__(connection=connection)
  
          self.universe = None
          self.networks = {}
          self.disease_to_id = {}
          self.hash_to_node = {}
  
      def insert_graph(self, graph, **kwargs):
          """
          :param pybel.BELGraph graph:
          :param kwargs: Swallowed. Just used to match signature of pybel.Manager
          :rtype: Network
          """
          result = _Namespace()
          result.id = len(self.networks)
  
          self.networks[result.id] = graph
  
          return result
  
      def get_graph_by_id(self, network_id):
          """Returns a graph by its id
  
          :param int network_id:
          :rtype: pybel.BELGraph
          """
          return self.networks[network_id]
  
      def get_graphs_by_ids(self, network_ids):
          """
          :param list[int] network_ids:
          :rtype: list[pybel.BELGraph]
          """
          return [
              self.networks[network_id]
              for network_id in network_ids
          ]
  
new_contents: # -*- coding: utf-8 -*-
  
  """This class contains an alternate implementation of the PyBEL database manager that only stores graphs
  in memory
  """
  
  from pybel.manager import Manager
  
  
  class _Namespace(object):
      pass
  
  
  class DictManager(Manager):
      """A dictionary-based implementation of the PyBEL Manager"""
  
      def __init__(self, connection=None):
          """
          :param Optional[str] connection:
          """
          super(DictManager, self).__init__(connection=connection)
  
          self.universe = None
          self.networks = {}
          self.disease_to_id = {}
          self.hash_to_node = {}
  
      def insert_graph(self, graph, **kwargs):
          """
          :param pybel.BELGraph graph:
          :param kwargs: Swallowed. Just used to match signature of pybel.Manager
          :rtype: Network
          """
          result = _Namespace()
          result.id = len(self.networks)
  
          self.networks[result.id] = graph
  
          return result
  
      def get_graph_by_id(self, network_id):
          """Returns a graph by its id
  
          :param int network_id:
          :rtype: pybel.BELGraph
          """
          return self.networks[network_id]
  
      def get_graphs_by_ids(self, network_ids):
          """
          :param list[int] network_ids:
          :rtype: list[pybel.BELGraph]
          """
          return [
              self.networks[network_id]
              for network_id in network_ids
          ]
  
subject: Update documentation