python 3的简单状态机
simplesm的Python项目详细描述
简化
python 3的简单状态机，使用字典创建状态。
安装
pip3 install simplesm
文档
SimpleSM子类应该有：
| Property | Description |
|---|---|
| ^{ | machine will start from this state. |
| ^{ | machine current state |
| ^{ | machine previous state |
| ^{ | test action shows current value to be tested, it will be set before testing it against machine states, so it will always have the latest value tested even if machine does not accept that action. |
| ^{ | machine current action, this value will be set after action being accepted by state, so it will always have the latest acceptable value tested. |
| ^{ | just the last acceptable action before ^{ |
| ^{ | return ^{ |
| ^{ | machine states! is a dict with keys as machine states, each state value is a dict too. |
计算机statesdict值可以有：
| Property | Description |
|---|---|
| ^{ | a dict that keys are acceptable actions (that could be string or a function name) and values are dicts with ^{ |
| ^{ | this event will be called before testing action against machine states. |
| ^{ | if none of ^{ |
| ^{ | if exist and equals ^{ |
计算机首先尝试将操作字符串与当前状态转换匹配，如果没有找到，则尝试调用每个当前状态转换，如果返回True，则接受该转换。
| Method | Description |
|---|---|
| ^{ | get a string or list of strings as ^{ |
| ^{ | set ^{ |
| ^{ | get a string or list of strings as ^{ |
Example
的用法和功能从simplesm导入SimpleSM，并创建一个类：
fromsimplesmimportSimpleSMclassTestMachine(SimpleSM):start_state="S0"states={"S0":{"transitions":{"0":{"state":"S1","event":"print"},"1":{"state":"S2","event":"print"}},"event":"welcome"},"S1":{"final":False,"transitions":{"1":{"state":"S0","event":"print"}},"event":"welcome"},"S2":{"final":True,"transitions":{"0":{"state":"S1","event":"print"},"2":{"state":"S3","event":"print"},"is_a_to_d":{"state":"S0","event":"print"}},"else":"s2_wrong","event":"welcome"},"S3":{"event":"goto_s2"}}defgoto_s2(self):print("we are just going to state S2")self.current_state="S2"defwelcome(self):print("we are in state {0} and get action {1}".format(self.current_state,self.test_action))defprint(self):print("going from {0} to {1} with {2}".format(self.previous_state,self.current_state,self.current_action))defs2_wrong(self):print("unacceptable input {0}".format(self.test_action))self.current_state="Error"defis_a_to_d(self):ifself.test_actionin"abcd":returnTruereturnFalsedefmain():m=TestMachine()m.perform(list("0110112a1d011"))print("current state is",m.current_state,"before calling accept")print("does machine accept 0110112a1d011 ?",m.accept(list("0110112a1d011")))print("current state is",m.current_state,"after calling accept")print("current state is acceptable ?",m.is_acceptable)if__name__=='__main__':main()
输出：
we are in state S0 and get action 0
going from S0 to S1 with 0
we are in state S1 and get action 1
going from S1 to S0 with 1
we are in state S0 and get action 1
going from S0 to S2 with 1
we are in state S2 and get action 0
going from S2 to S1 with 0
we are in state S1 and get action 1
going from S1 to S0 with 1
we are in state S0 and get action 1
going from S0 to S2 with 1
we are in state S2 and get action 2
going from S2 to S3 with 2
we are just going to state S2
going from S2 to S0 with a
we are in state S0 and get action 1
going from S0 to S2 with 1
we are in state S2 and get action d
going from S2 to S0 with d
we are in state S0 and get action 0
going from S0 to S1 with 0
we are in state S1 and get action 1
going from S1 to S0 with 1
we are in state S0 and get action 1
going from S0 to S2 with 1
current state is S2 before calling accept
does machine accept 0110112a1d011 ? False
current state is S2 after calling accept
current state is acceptable ? True
欢迎加入QQ群-->： 979659372
