def execute(self, action):
self.classifications.append(action)<EOL>self.steps += <NUM_LIT:1><EOL>return None<EOL>
Execute the indicated action within the environment and
        return the resulting immediate reward dictated by the reward
        program.

        Usage:
            immediate_reward = scenario.execute(selected_action)

        Arguments:
            action: The action to be executed within the current situation.
        Return:
            A float, the reward received for the action that was executed,
            or None if no reward is offered.