class Classtionary(dict):
    """A Class, er, dictionary, um, attributes-as-keys thingy.

    >>> c = Classtionary(foo="bar")
    >>> d = dict(foo="bar")
    >>> c, d
    ({'foo': 'bar'}, {'foo': 'bar'})
    >>> c.fizz = "bang"
    >>> d.fizz = "bang"
    Traceback (most recent call last):
      File "<input>", line 1, in <module>
    AttributeError: 'dict' object has no attribute 'fizz'
    >>> d['fizz'] = "bang"
    >>> c['fizz']
    'bang'
    >>> c.fizz
    'bang'
    >>> d['fizz']
    'bang'
    >>> d.fizz
    Traceback (most recent call last):
      File "<input>", line 1, in <module>
    AttributeError: 'dict' object has no attribute 'fizz'
    """

    def __init__(self, **kwargs):
        self.__dict__ = self
        self.update(kwargs)