Python有没有办法阻止我的list类发生变化？

Question

我有一个名为Maps的类，我从中创建了两个列表l和lm。l应该随着某个事件而改变，但是lm（内存列表）应该保持原样。你知道吗

有没有办法防止我的列表类发生变化？ 打你！你知道吗

class Maps(list):

    def createInitial(self, lvlC):
        #self.extend(mapDico[lvlC.value])

    #get (i,j) coords of "i" in l
    def findI(self):
        for ordinate, abscissa in enumerate(self):
            try:
                return (ordinate, abscissa.index("i"))
            except:
                pass

    #get number of "x" in lm
    def countX(self):
        nbX=0
        for rows in range(len(self)):
            for elements in range(len(self)):
                if self[rows][elements]=="x":
                    nbX+=1
        return nbX

    #load next map
    def nextLevel(self, nxtL):
        del self[:]
        self.extend(mapDico[nxtL])

lvlC=Counters()
lm=Maps()
lm.createInitial(lvlC)
l=Maps()
l.createInitial(lvlC)

这里开始“控制器”文件：

             if goalC.value>0 and goalC.value==lm.countX():
            lvlC.increment(1)
            #lvl.config(text=" | Level Complete ", bg="limegreen")
            l.nextLevel(lvlC.value)
            lm.nextLevel(lvlC.value)
            muvC.reinitialize()
            nbMuv.config(text="Moves: "+str(muvC.value))
            pushC.reinitialize()
            nbPush.config(text=" | Pushes: "+str(pushC.value))
            goalC.reinitialize()
            nbGoal.config(text=" | Goals: "+str(goalC.value))
            lvl.config(text=" | Current level: "+str(lvlC.value), bg="darkgray")
            print("New moves",muvC.value, "New pushes",pushC.value, "New level",lvlC.value)
            print("New countX: ", lm.countX())
            print("New goals: ", goalC.value)
            for i in l:
                print(i)
            for i in lm:
                print(i)
            can.delete("all")
            for i in r:
                for j in r:
                    time.sleep(.005)
                    can.create_rectangle(j*n, i*n, j*n+n, i*n+n, fill=fillSquare(i,j, l), outline="darkslategray")

Answer 1

您可能需要使用不同的类来定义这些东西。让同一类的实例同时可变和不可变不是一个好主意。你知道吗

所以我建议您在MixinClass中定义所有方法，然后创建两个类，一个是list（可变）的子类，另一个是tuple（不可变）的子类

Answer 2

也许是这样的

class BaseMaps(list):

def createInitial(self, lvlC):
    #self.extend(mapDico[lvlC.value])

#get (i,j) coords of "i" in l
def findI(self):
    for ordinate, abscissa in enumerate(self):
        try:
            return (ordinate, abscissa.index("i"))
        except:
            pass

#get number of "x" in lm
def countX(self):
    nbX=0
    for rows in range(len(self)):
        for elements in range(len(self)):
            if self[rows][elements]=="x":
                nbX+=1
    return nbX

#load next map
def nextLevel(self, nxtL):
    del self[:]
    self.extend(mapDico[nxtL])



class Maps(BaseMaps):

    pass


class ReadOnlyMaps(BaseMaps):
    def __init__(self, other):
        self._list = other

    def __getitem__(self, index):
        return self._list[index]

    def __iter__(self):
        return iter(self._list)

    def __slice__(self, *args, **kw):
        return self._list.__slice__(*args, **kw)

    def __repr__(self):
        return repr(self._list)

    def __len__(self):
        return len(self._list)

    def NotImplemented(self, *args, **kw):
        raise ValueError("Read Only list proxy")

    append = pop = __setitem__ = __setslice__ = __delitem__ = NotImplemented