python 状态机语句"Python is fun"褒贬义判断的两种实现方式

0、

背景：思考下怎么对一句话如python is bad判断出这是贬义。

版本：

pip install transitions==0.6.1

python == 2.7.10

1、

网上教程大部分如：http://www.cnblogs.com/21207-iHome/p/6085334.html 这篇博客上的写法。

# coding=utf-8############################################################### 代码来源: https://www.python-course.eu/finite_state_machine.php# 目标：输入一段str如：python is good.#      判断出这句话是褒义还是贬义的。##############################################################class StateMahine(object):    def __init__(self):        """        有限状态机是一个五元组M=(Q,Σ,δ,q0,F)，其中：            Q = {q0,q1,...,qn}是有限状态集合。在任一确定的时刻，有限状态机只能处于一个确定的状态qiqi；            Σ = {σ1,σ2,...,σn}是有限输入字符集合。在任一确定的时刻，有限状态机只能接收一个确定的输入σjσj；            δ: Q×Σ→Q是状态转移函数，在某一状态下，给定输入后有限状态机将转入状态迁移函数决定的一个新状态；            q0 ∈ Q是初始状态，有限状态机由此状态开始接收输入；            F ⊆ Q是最终状态集合，有限状态机在达到终态后不再接收输入。        """        self.handlers = {}  # 这就是状态转移函数δ        self.startState = None  # 初始状态q0        self.endStates = []  # 最终状态集合F    def add_state(self, name, handler, end_state=0):        name = name.upper()        self.handlers[name] = handler        if end_state:            self.endStates.append(name)    def set_start(self, name):        self.startState = name.upper()    def run(self, cargo):        try:            handler = self.handlers[self.startState]        except:            raise Exception("must call .set_start() before .run()")        if not self.endStates:            raise Exception("at least one state must be an end_state")        while 1:            newState, cargo = handler(cargo)            if newState.upper() in self.endStates:                print ("Reached ", newState)                break            else:                handler = self.handlers[newState.upper()]positive_adjectives = ["great", "super", "fun", "entertraining", "easy"]negative_adjectives = ["boring", "difficult", "ugly", "bad"]def start_transitions(txt):    """        s = "python is good"        s.split(None, 1)        ['python', 'is good']    """    splitted_txt = txt.split(None, 1)    word, txt = splitted_txt if len(splitted_txt) > 1 else (txt, "")    if word == "Python":        newState = "Python_state"    else:        newState = "error_state"    return (newState, txt)def python_state_transitions(txt):    splitted_txt = txt.split(None,1)    word, txt = splitted_txt if len(splitted_txt) > 1 else (txt,"")    if word == "is":        newState = "is_state"    else:        newState = "error_state"    return (newState, txt)def is_state_transitions(txt):    splitted_txt = txt.split(None,1)    word, txt = splitted_txt if len(splitted_txt) > 1 else (txt,"")    if word == "not":        newState = "not_state"    elif word in positive_adjectives:        newState = "pos_state"    elif word in negative_adjectives:        newState = "neg_state"    else:        newState = "error_state"    return (newState, txt)def not_state_transitions(txt):    splitted_txt = txt.split(None,1)    word, txt = splitted_txt if len(splitted_txt) > 1 else (txt,"")    if word in positive_adjectives:        newState = "neg_state"    elif word in negative_adjectives:        newState = "pos_state"    else:        newState = "error_state"    return (newState, txt)if __name__ == '__main__':    m = StateMahine()    m.add_state("Start", start_transitions)    m.add_state("Python_state", python_state_transitions)    m.add_state("is_state", is_state_transitions)    m.add_state("not_state", not_state_transitions)    m.add_state("neg_state", None, end_state=1)    m.add_state("pos_state", None, end_state=1)    m.add_state("error_state", None, end_state=1)    m.set_start("Start")    m.run("Python is great")    m.run("Python is not great")    m.run("Python is not fun")    m.run("Python is ugly")    m.run("Pythoniseasy")    m.run("Python is easy1")"""结果：Reached  pos_stateReached  neg_stateReached  neg_stateReached  neg_stateReached  error_stateReached  error_state采用这种算法结构对每一个状态进行封装处理，逻辑清晰。"""

2、

但其实我们研究了这个transitions库，理论上也可以实现的吧。 研究的博客：点击打开链接

# coding=utf-8############################################################### 目标：判断"Python is bad"这句话的褒贬义# 环境： pip install transitions# 这个库简直碉堡了...# by ouyang 2017年10月10日 星期二##############################################################from transitions import Machineclass Matter(object):    def __init__(self, words, positive_adjectives, negative_adjectives):        self.original_s = self.s = words # 保留原始的字符串        self.positive_adjectives = positive_adjectives        self.negative_adjectives = negative_adjectives        self.result = None  # 结果保存    def on_enter_Start(self):        splitted_txt = self.s.split(None, 1)        word, txt = splitted_txt if len(splitted_txt) > 1 else (self.s, "")        if word == 'Python':            self.next_state = self.to_Python        else:            self.next_state = self.to_error        self.s = txt    def on_enter_Python(self):        splitted_txt = self.s.split(None, 1)        word, txt = splitted_txt if len(splitted_txt) > 1 else (self.s, "")        if word == 'is':            self.next_state = self.to_is        else:            self.next_state = self.to_error        self.s = txt    def on_enter_is(self):        splitted_txt = self.s.split(None, 1)        word, txt = splitted_txt if len(splitted_txt) > 1 else (self.s, "")        if word == "not":            self.next_state = self.to_not        elif word in self.positive_adjectives:            self.next_state = self.to_positive        elif word in self.negative_adjectives:            self.next_state = self.to_negative        else:            self.next_state = self.to_error        self.s = txt    def on_enter_not(self):        splitted_txt = self.s.split(None, 1)        word, txt = splitted_txt if len(splitted_txt) > 1 else (self.s, "")        if word in self.positive_adjectives:            self.next_state = self.to_negative        elif word in self.negative_adjectives:            self.next_state = self.to_positive        else:            self.next_state = self.to_error        self.s = txt    def on_enter_negative(self):        self.result = "Negative!!!"        self.next_state = None    def on_enter_positive(self):        self.result = "Positive!!!"        self.next_state = None    def on_enter_error(self):        self.result = "Error！！！"        self.next_state = None    def run(self):        while self.next_state:            print "now state = %s!" % self.state            self.next_state()if __name__ == '__main__':    words_list = ["Python is not bad",                  "Python is bad",                  "Python is fun",                  "Python is not fun",                  "Python1 is bad",                  "Python is1 bad",                  "Python is bad111"]    for words in words_list:        print "#" * 50        positive_adjectives = ["great", "super", "fun", "entertraining", "easy"]        negative_adjectives = ["boring", "difficult", "ugly", "bad"]        model = Matter(words, positive_adjectives, negative_adjectives)        # 定义状态        states = ["Start", "Python", "is", "not",  "positive", "negative", "error"]        # 初始化状态机        machine = Machine(model=model, states=states, ordered_transitions=True)        # 计算结果        model.run()        print model.original_s, "=", model.result

结果：

##################################################now state = initial!now state = Start!now state = Python!now state = is!now state = not!Python is not bad = Positive!!!##################################################now state = initial!now state = Start!now state = Python!now state = is!Python is bad = Negative!!!##################################################now state = initial!now state = Start!now state = Python!now state = is!Python is fun = Positive!!!##################################################now state = initial!now state = Start!now state = Python!now state = is!now state = not!Python is not fun = Negative!!!##################################################now state = initial!now state = Start!Python1 is bad = Error！！！##################################################now state = initial!now state = Start!now state = Python!Python is1 bad = Error！！！##################################################now state = initial!now state = Start!now state = Python!now state = is!Python is bad111 = Error！！！

相关的demo放到：https://github.com/emaste-r/state_demo

如果觉得可以的话，帮忙去github点个star哟~

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