写了一个贼丑的
```Python

class Duck(dict):
def __init__(self, *args, **kw):
return super(Duck, self).__init__(self, *args, **kw)

def __getattr__(self, key):
try:
return self[key]
except KeyError as e:
print e

def __setattr__(self, *args, **kw):
object.__setattr__(self, *args, **kw)
for k, v in self.__dict__.items():
if k not in self.keys():
self[k] = v


if __name__ == "__main__":
s = Duck()
# as a dict
s['a'] = 1
print s.a
# set and get attribute
s.c = [1,3]
print s.c
print s['c']
```