struct.py

#coding: utf-8
class Struct(dict):
    """
    - 为字典加上点语法. 例如:
    >>> o = Struct({'a':1})
    >>> o.a
    >>> 1
    >>> o.b
    >>> None
    """
    def __init__(self, *e, **f):
        if e:
            self.update(e[0])
        if f:
            self.update(f)

    def __getattr__(self, name):
        # Pickle is trying to get state from your object, and dict doesn't implement it. 
        # Your __getattr__ is being called with "__getstate__" to find that magic method, 
        # and returning None instead of raising AttributeError as it should.
        if name.startswith('__'):
            raise AttributeError
        return self.get(name)

    def __setattr__(self, name, val):
        self[name] = val
    
    def __hash__(self):
        return id(self)