parameters: (self, node)
docstring: returns the identifier/key for saving nodal results in the json
          this can be either the node Id or its coordinates
          The coordinates can be used to check the nodal results in MPI
  
          Keyword arguments:
          self -- It signifies an instance of a class.
          node -- The Kratos node to get the identifier for
docstring_summary: returns the identifier/key for saving nodal results in the json
          this can be either the node Id or its coordinates
          The coordinates can be used to check the nodal results in MPI
docstring_tokens: returns the identifier / key for saving nodal results in the json this can be either the node Id or its coordinates The coordinates can be used to check the nodal results in MPI
function: def __get_node_identifier(self, node):
          """ returns the identifier/key for saving nodal results in the json
          this can be either the node Id or its coordinates
          The coordinates can be used to check the nodal results in MPI
  
          Keyword arguments:
          self -- It signifies an instance of a class.
          node -- The Kratos node to get the identifier for
          """
          if self.use_node_coordinates:
              digits = 6
              return 'X_%.*f_Y_%.*f_Z_%.*f' % (digits, node.X0, digits, node.Y0, digits, node.Z0)
          else:
              return str(node.Id)
function_tokens: def __get_node_identifier ( self , node ) : if self . use_node_coordinates : digits = 6 return 'X_%.*f_Y_%.*f_Z_%.*f' % ( digits , node . X0 , digits , node . Y0 , digits , node . Z0 ) else : return str ( node . Id )