:class:`defaultdict` objects support the following method in addition to the
standard :class:`dict` operations:
- .. method:: defaultdict.__missing__(key)
+ .. method:: __missing__(key)
If the :attr:`default_factory` attribute is ``None``, this raises a
:exc:`KeyError` exception with the *key* as argument.
:class:`defaultdict` objects support the following instance variable:
- .. attribute:: defaultdict.default_factory
+ .. attribute:: default_factory
This attribute is used by the :meth:`__missing__` method; it is
initialized from the first argument to the constructor, if present, or to
.. versionadded:: 3.1
-.. method:: OrderedDict.popitem(last=True)
+ .. method:: popitem(last=True)
- The :meth:`popitem` method for ordered dictionaries returns and removes
- a (key, value) pair. The pairs are returned in LIFO order if *last* is
- true or FIFO order if false.
+ The :meth:`popitem` method for ordered dictionaries returns and removes a
+ (key, value) pair. The pairs are returned in LIFO order if *last* is true
+ or FIFO order if false.
In addition to the usual mapping methods, ordered dictionaries also support
reverse iteration using :func:`reversed`.
initialized with its contents; note that a reference to *initialdata* will not
be kept, allowing it be used for other purposes.
-In addition to supporting the methods and operations of mappings,
-:class:`UserDict` instances provide the following attribute:
+ In addition to supporting the methods and operations of mappings,
+ :class:`UserDict` instances provide the following attribute:
-.. attribute:: UserDict.data
+ .. attribute:: data
- A real dictionary used to store the contents of the :class:`UserDict` class.
+ A real dictionary used to store the contents of the :class:`UserDict`
+ class.
defaulting to the empty list ``[]``. *list* can be any iterable, for
example a real Python list or a :class:`UserList` object.
-In addition to supporting the methods and operations of mutable sequences,
-:class:`UserList` instances provide the following attribute:
+ In addition to supporting the methods and operations of mutable sequences,
+ :class:`UserList` instances provide the following attribute:
-.. attribute:: UserList.data
+ .. attribute:: data
- A real :class:`list` object used to store the contents of the
- :class:`UserList` class.
+ A real :class:`list` object used to store the contents of the
+ :class:`UserList` class.
**Subclassing requirements:** Subclasses of :class:`UserList` are expect to
offer a constructor which can be called with either no arguments or one