Python語言的有限狀態機器實現範例

標籤：ted   connect   sed   not   usr   狀態機器   TE   實現   open()   

#!/usr/bin/env python3class Connection(object):    def __init__(self):        self.change_state(ClosedConnection)    def change_state(self,new_state):        self.__class__ = new_state    def read(self):        raise NotImplementedError("未實現")    def write(self):        raise NotImplementedError("未實現")    def open(self):        raise NotImplementedError("未實現")    def close(self):        raise NotImplementedError("未實現")class OpenedConnection(Connection):    def read(self):        print("read")    def write(self):        print("write")    def open(self):        raise RuntimeError("串連已經開啟")    def close(self):        self.change_state(ClosedConnection)class ClosedConnection(Connection):    def read(self):        raise RuntimeError("串連沒有開啟")    def write(self):        raise RuntimeError("串連沒有開啟")    def open(self):        self.change_state(OpenedConnection)    def close(self):        raise RuntimeError("串連已經關閉") if __name__=="__main__":    conn = Connection()    conn.open()    conn.write()

 

Python語言的有限狀態機器實現範例