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Diffstat (limited to 'Doc/library/collections.rst')
| -rw-r--r-- | Doc/library/collections.rst | 20 |
1 files changed, 7 insertions, 13 deletions
diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst index e18dfcf..bb2140c 100644 --- a/Doc/library/collections.rst +++ b/Doc/library/collections.rst @@ -10,16 +10,10 @@ This module implements high-performance container datatypes. Currently, there are two datatypes, :class:`deque` and :class:`defaultdict`, and -one datatype factory function, :func:`namedtuple`. - -Besides the containers provided here, the optional :mod:`bsddb` -module offers the ability to create in-memory or file based ordered -dictionaries with string keys using the :meth:`bsddb.btopen` method. - -In addition to containers, the collections module provides some ABCs -(abstract base classes) that can be used to test whether a class -provides a particular interface, for example, is it hashable or -a mapping. +one datatype factory function, :func:`namedtuple`. This module also +provides the :class:`UserDict` and :class:`UserList` classes which may +be useful when inheriting directly from :class:`dict` or +:class:`list` isn't convenient. The specialized containers provided in this module provide alternatives to Python's general purpose built-in containers, :class:`dict`, @@ -29,9 +23,9 @@ module offers the ability to create in-memory or file based ordered dictionaries with string keys using the :meth:`bsddb.btopen` method. In addition to containers, the collections module provides some ABCs -(abstract base classes) that can be used to test whether a class +(abstract base classes). These can be used to test whether a class provides a particular interface, for example, is it hashable or -a mapping. +a mapping, and some of them can also be used as mixin classes. ABCs - abstract base classes ---------------------------- @@ -114,7 +108,7 @@ Notes on using :class:`Set` and :class:`MutableSet` as a mixin: Since some set operations create new sets, the default mixin methods need a way to create new instances from an iterable. The class constructor is assumed to have a signature in the form ``ClassName(iterable)``. - That assumption is factored-out to a singleinternal classmethod called + That assumption is factored-out to a single internal classmethod called :meth:`_from_iterable` which calls ``cls(iterable)`` to produce a new set. If the :class:`Set` mixin is being used in a class with a different constructor signature, you will need to override :meth:`from_iterable` |