Python实现的一个简单的状态框架的代码

将开发过程经常用的内容珍藏起来，如下的代码内容是关于Python实现的一个简单的状态框架的代码。

from time import sleep
from random import randint, shuffle

class StateMachine(object):
‘’’ Usage: Create an instance of StateMachine, use set_starting_state(state) to give it an
initial state to work with, then call tick() on each second (or whatever your desired
time interval might be. ‘’’

def set_starting_state(self, state):
    ''' The entry state for the state machine. '''
    state.enter()
    self.state = state
    
def tick(self):
    ''' Calls the current state's do_work() and checks for a transition '''
    next_state = self.state.check_transitions()
    
    if next_state is None:
        # Stick with this state
        self.state.do_work()
    else:
        # Next state found, transition to it
        self.state.exit()
        next_state.enter()
        self.state = next_state

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