code: def build_state_assignment(self, runnable, regime, state_assignment):
          
  
          return ['self.{0} = {1}'.format(\
              state_assignment.variable,
              self.build_expression_from_tree(runnable,
                                              regime,
                                              state_assignment.expression_tree))]
docs: Build state assignment code.
  
          @param state_assignment: State assignment object
          @type state_assignment: lems.model.dynamics.StateAssignment
  
          @return: Generated state assignment code
          @rtype: string