怎么让python断言正确

如何让python断言正确
如题，补充C中的代码，让断言正确
d={'a':'1','b':'m','c':'2010-01-01','d':'2'}
class C(object):
    pass

c=C()

print 'c.a=',c.a
print 'c.b=',c.b
print 'c.c=',c.c
print 'c.d=',c.d
c.a =d['a']
assert c.a == 1
c.b=d['b']
assert c.b=='m'
c.c=d['c']
assert c.c==datetime.datetime(2010,1,1).date()
c.d=d['d']
assert c.d=='2'
------解决思路----------------------

引用:

如题，补充C中的代码，让断言正确

import datetime

d={'a':'1','b':'m','c':'2010-01-01','d':'2'}

class C(object):

    def __init__(self):

        self.a = 0

        self.b = 0

        self.c = 0

        self.d = 0

    def __setattr__(self, name, value):

        self.__dict__[name]=value

    def __getattribute__(self, name):

        if name == "a":

            return int(object.__getattribute__(self, name))

        if name == "c":

            return datetime.datetime.strptime(object.__getattribute__(self, name),'%Y-%m-%d').date()

            

        return object.__getattribute__(self, name)

c=C()


c.a=d['a']

assert c.a==1

c.b=d['b']

assert c.b=='m'

c.c=d['c']

assert c.c==datetime.datetime(2010,1,1).date()

c.d=d['d']

assert c.d=='2' 

#这题应该考的是重载类的内置函数  已解