code: def install_labels(cls, quiet=True, stdout=None):
      
  
      if not hasattr(cls, '__label__'):
          if not quiet:
              stdout.write(' ! Skipping class {0}.{1} is abstract\n'.format(cls.__module__, cls.__name__))
          return
  
      for name, property in cls.defined_properties(aliases=False, rels=False).items():
          db_property = property.db_property or name
          if property.index:
              if not quiet:
                  stdout.write(' + Creating index {0} on label {1} for class {2}.{3}\n'.format(
                      name, cls.__label__, cls.__module__, cls.__name__))
  
              db.cypher_query("CREATE INDEX on :{0}({1}); ".format(
                  cls.__label__, db_property))
  
          elif property.unique_index:
              if not quiet:
                  stdout.write(' + Creating unique constraint for {0} on label {1} for class {2}.{3}\n'.format(
                      name, cls.__label__, cls.__module__, cls.__name__))
  
              db.cypher_query("CREATE CONSTRAINT "
                              "on (n:{0}) ASSERT n.{1} IS UNIQUE; ".format(
                  cls.__label__, db_property))
docs: Setup labels with indexes and constraints for a given class
  
      :param cls: StructuredNode class
      :type: class
      :param quiet: (default true) enable standard output
      :param stdout: stdout stream
      :type: bool
      :return: None