dictionary as attribute of a class...

[tinauser]

Hallo list,
here again I have a problem whose solution might be very obvious, but
I really cannot see it:
I have a class having as attribute a dictionary whose keys are names
and values are instance of another class.
This second class has in turn as an attribute a dictionary.
I want a function of the first class that can change value of one of
the second class instance's dictionary.
however I cannot do it without modifying this attribute for ALL the
instance of the second class contained in the first class' dictionary.
What I'm doing wrong?

the code:

###############
###can i change a dictionary attribute of an instantated object
without affectin all the instances of that object?

class mistClass():
    def __init__(self,name,cDict={}):
        print 'mistClass ',name,' Init'
        self._name=name
        self._cDict=cDict

    def setName(self,n):
        self._name=n

    def getName(self):
        return self._name

##    def setDict(self,one,two):
##        self._cDict['one']=one
##        self._cDict['two']=two
    def setDict(self,listK,listV):
        assert len(listK)==len(listV)
        for k,v in zip(listK,listV):
            self._cDict[k]=v

    def getDict(self):
        return self._cDict

class mistClassContainer():
    def __init__(self,name,dict_of_mistclass={}):
        print 'init mistClassContainer ',name
        self._name=name
        self._DOM=dict_of_mistclass

    def add_mistclass(self,mc):
        for el in mc:
            self._DOM[el]=mistClass(el)

##    def mod_mistclasscDict(self,mc,one,two):
##        self._DOM[mc].setDict(one,two)
    def mod_mistclasscDict(self,mc,lK,lV):
        self._DOM[mc].setDict(lK,lV)

a=mistClassContainer('firsmistclasscontainer')
a.add_mistclass(['mc1','mc2','mc3','mc4','mc5','mc6'])
print 'before modification'
for el in a._DOM.iterkeys():
    print a._DOM[el].getDict()
    print a._DOM[el].getName()

a.mod_mistclasscDict('mc1',['one','two'],['modone','modtwo'])
print 'after modification'
for el in a._DOM.iterkeys():
    print a._DOM[el].getDict()
    print a._DOM[el].getName()

b=mistClass('mc7')
print b.getDict()
print b.getName()
b.setName('modified name')
b.getName()

for el in a._DOM.iterkeys():
    print a._DOM[el].getName()