Dict
----

.. py:class:: pydu.dict.AttrDict(seq=None, **kwargs)

    A AttrDict object is like a dictionary except ``obj.foo`` can be used
    in addition to ``obj['foo']``.

    >>> from pydu.dict import AttrDict
    >>> o = AttrDict(a=1)
    o.a
    1
    >>> o['a']
    1
    >>> o.a = 2
    >>> o['a']
    2
    >>> del o.a
    >>> o.a
    Traceback (most recent call last):
     ...    AttributeError: 'a'


.. py:class:: pydu.dict.CaseInsensitiveDict(data=None, **kwargs)

    A case-insensitive ``dict``-like object.
    Implements all methods and operations of ``collections.MutableMapping``
    as well as dict's ``copy``. Also provides ``lower_items``.
    All keys are expected to be strings. The structure remembers the
    case of the last key to be set, and ``iter(instance)``, ``keys()``,
    ``items()``, ``iterkeys()``, and ``iteritems()`` will contain
    case-sensitive keys.

    >>> from pydu.dict import CaseInsensitiveDict
    >>> cid = CaseInsensitiveDict()
    >>> cid['Accept'] = 'application/json'
    >>> cid['aCCEPT'] == 'application/json'
    True
    >>> list(cid) == ['Accept']
    True


.. py:class:: pydu.dict.LookupDict(name=None)

    Dictionary lookup object.

    >>> from pydu.dict import LookupDict
    >>> d = LookupDict()
    >>> d['key']
    None
    >>> d['key'] = 1
    >>> d['key']
    1

.. py:class:: pydu.dict.OrderedDefaultDict(default_factory=None, *args, **kwds)

    Dictionary that remembers insertion order and has default value
    with default factory.

    The default factory is called without arguments to produce
    a new value when a key is not present, in ``__getitem__`` only.
    An ``OrderedDefaultDict`` compares equal to a ``collections.defaultdict``
    with the same items. All remaining arguments are treated the same
    as if they were passed to the ``defaultdict`` constructor,
    including keyword arguments.

    >>> from pydu.dict import OrderedDefaultDict
    >>> d = OrderedDefaultDict(int)
    >>> d['b']
    0
    >>> d['a']
    0
    >>> d.keys()
    odict_keys(['b', 'a'])


.. py:function:: pydu.dict.attrify(obj)

    Attrify obj into ``AttriDict`` or ``list of AttriDict`` if the obj is list.
    If obj or the item of obj is not list or dict, will return itself.

        >>> from pydu.dict import attrify
        >>> attrd = attrify({
            'a': [1, 2, {'b': 'b'}],
            'c': 'c',
        })
        >>> attrd
        <AttrDict {'a': [1, 2, <AttrDict {'b': 'b'}>], 'c': 'c'}>
        >>> attrd.a
        1
        >>> attrd.a[2].b
        b
        >>> attrd.c
        c