```python
class Dict(dict):
'''
Simple dict but support access as x.y style.
'''
def __init__(self, d):
super(Dict, self).__init__()
for k, v in d.items():
self[k] = Dict(v) if isinstance(v, dict) else v

def __getattr__(self, key):
try:
return self[key]
except KeyError:
raise AttributeError(r"'Dict' object has no attribute '%s'" % key)

def __setattr__(self, key, value):
self[key] = value
```

使用：
```python
>>> dic = Dict({'a':1,'b':2})
>>> dic.b
2
```


修改自廖雪峰的 python 教程：
http://www.liaoxuefeng.com/wiki/0014316089557264a6b348958f449949df42a6d3a2e542c000/001432339034336cbf72acd43354d72831461e3871d9f2e000