new_contents: 
  import networkx as nx
  from harmonic_centrality import harmonic_centrality
  
  class measurmnets:
      original_graph = nx.Graph()
      modified_graph = nx.Graph()
      sol_graph      = nx.Graph()
      measure = {}
      def __init__(self,original_graph, modified_graph,sol_graph):
          self.original_graph = original_graph
          self.modified_graph = modified_graph
          self.sol_graph      = sol_graph
  
      def calculate_measures(self):
          pass
      def harmonic_mean(self,graph):
          return harmonic_centrality(graph)
      def subgraph_centrality(self,graph):
          return nx.communicability_centrality(graph)
      def modularity(self,graph):
          return nx.modularity_spectrum(graph)
      def transitivity(self,graph):
          return nx.transitivity(graph)
subject: implement measurements