https://github.com/makinacorpus/easydict
可惜有个问题 如果 key 不存在会爆出错误 我觉得返回 None 比较合理

#_*_ coding: utf-8 _*_

#  https://github.com/makinacorpus/easydict

class EasyDict(dict):
    """
    Get attributes

    >>> d = EasyDict({'foo':3})
    >>> d['foo']
    3
    >>> d.foo
    3
    >>> d.bar
    Traceback (most recent call last):
    ...
    AttributeError: 'EasyDict' object has no attribute 'bar'

    Works recursively

    >>> d = EasyDict({'foo':3, 'bar':{'x':1, 'y':2}})
    >>> isinstance(d.bar, dict)
    True
    >>> d.bar.x
    1

    Bullet-proof

    >>> EasyDict({})
    {}
    >>> EasyDict(d={})
    {}
    >>> EasyDict(None)
    {}
    >>> d = {'a': 1}
    >>> EasyDict(**d)
    {'a': 1}

    Set attributes

    >>> d = EasyDict()
    >>> d.foo = 3
    >>> d.foo
    3
    >>> d.bar = {'prop': 'value'}
    >>> d.bar.prop
    'value'
    >>> d
    {'foo': 3, 'bar': {'prop': 'value'}}
    >>> d.bar.prop = 'newer'
    >>> d.bar.prop
    'newer'


    Values extraction

    >>> d = EasyDict({'foo':0, 'bar':[{'x':1, 'y':2}, {'x':3, 'y':4}]})
    >>> isinstance(d.bar, list)
    True
    >>> from operator import attrgetter
    >>> map(attrgetter('x'), d.bar)
    [1, 3]
    >>> map(attrgetter('y'), d.bar)
    [2, 4]
    >>> d = EasyDict()
    >>> d.keys()
    []
    >>> d = EasyDict(foo=3, bar=dict(x=1, y=2))
    >>> d.foo
    3
    >>> d.bar.x
    1

    Still like a dict though

    >>> o = EasyDict({'clean':True})
    >>> o.items()
    [('clean', True)]

    And like a class

    >>> class Flower(EasyDict):
    ...     power = 1
    ...
    >>> f = Flower()
    >>> f.power
    1
    >>> f = Flower({'height': 12})
    >>> f.height
    12
    >>> f['power']
    1
    >>> sorted(f.keys())
    ['height', 'power']
    """
    def __init__(self, d=None, **kwargs):
        if d is None:
            d = {}
        if kwargs:
            d.update(**kwargs)
        for k, v in d.items():
            setattr(self, k, v)
        # Class attributes
        for k in self.__class__.__dict__.keys():
            if not (k.startswith('__') and k.endswith('__')):
                setattr(self, k, getattr(self, k))

    def __setattr__(self, name, value):
        if isinstance(value, (list, tuple)):
            def get_EasyDict_list(value):
                return [EasyDict(x) if isinstance(x, dict) else x if not isinstance(x, (list, tuple)) else get_EasyDict_list(x) for x in value]
            value = get_EasyDict_list(value)
        else:
            value = EasyDict(value) if isinstance(value, dict) else value
        super(EasyDict, self).__setattr__(name, value)
        self[name] = value

    def __getattr__(self, name):
        """
        如果 key 不存在返回 None
        """
        try:
            return super(EasyDict, self).__getattr__(name)
        except AttributeError:
            try:
                return self[name]
            except KeyError:
                key = name or ""
                if key.startswith('__') and key.endswith('__'):
                    raise AttributeError
                return None


if __name__ == "__main__":
    import doctest
    doctest.testmod()

    import json
    d = EasyDict({'a': 1, 'b': [1,2], 'c': {'x': 1, 'y': 2},'d':[[{'x':3, 'y':4}]]})

    print d.a
    print d.b
    print d.c
    print d.c.x, d.c.y
    print d.d
    print d.e

    d.e = 100
    print d.e
    d.c.z = 4
    d.b.append(10)
    print d.d[0][0].x
    print d.d[0][0].y

    d.f = [1,2,3,4,5]
    print d.f
    print d['f']
    print json.dumps(d)

    print(hasattr(d, 'a'))
    print(hasattr(d, 'b'))
    print(hasattr(d, 'adfasfc'))
    print(hasattr(d, 'd'))
    print(hasattr(d[0][0], 'x'))
    print(hasattr(d[0][0], 'y'))
    print(hasattr(d[0][0], 'z'))

    x = EasyDict()
    x['abcd'] = 10
    print(x['abcd'])
    print(x.abcd)