old_contents: import networkx as nx
  import community
  
  
  class Louvan(object):
      def __init__(self, gexf_file):
          self.gexf_file = gexf_file
          self.graph = None
          self.partition = {}
          self.clusters = {}
  
      def __get_community(self):
          self.graph = nx.read_gexf(self.gexf_file)
          self.partition = community.best_partition(self.graph)
  
      def get_cluster(self):
          self.__get_community()
          for node_id, partition_id in self.partition.iteritems():
              if partition_id not in self.clusters.keys():
                  self.clusters[partition_id] = []
              self.clusters[partition_id].append(node_id)
  
          return self.clusters
  
new_contents: import networkx as nx
  import community
  
  
  class Louvain(object):
      def __init__(self, gexf_file):
          self.gexf_file = gexf_file
          self.graph = None
          self.partition = {}
          self.clusters = {}
  
      def __get_community(self):
          self.graph = nx.read_gexf(self.gexf_file)
          self.partition = community.best_partition(self.graph)
  
      def get_cluster(self):
          self.__get_community()
          for node_id, partition_id in self.partition.iteritems():
              if partition_id not in self.clusters.keys():
                  self.clusters[partition_id] = []
              self.clusters[partition_id].append(node_id)
  
          return self.clusters
  
subject: Rename from Louvan to Louvain