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Deleted two duplicated paragraphs in the intro. Added mention of 

UserDict and UserList and mixins in the intro. Fixed a typo.
This commit is contained in:
Mark Summerfield 2008-02-14 16:28:00 +00:00
parent 53349a005c
commit 71316b0378
1 changed files with 7 additions and 13 deletions
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Doc/library/collections.rst
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@ -10,16 +10,10 @@
This module implements high-performance container datatypes. Currently, This module implements high-performance container datatypes. Currently,
there are two datatypes, :class:`deque` and :class:`defaultdict`, and there are two datatypes, :class:`deque` and :class:`defaultdict`, and
one datatype factory function, :func:`namedtuple`. one datatype factory function, :func:`namedtuple`. This module also
provides the :class:`UserDict` and :class:`UserList` classes which may
Besides the containers provided here, the optional :mod:`bsddb` be useful when inheriting directly from :class:`dict` or
module offers the ability to create in-memory or file based ordered :class:`list` isn't convenient.
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.
The specialized containers provided in this module provide alternatives The specialized containers provided in this module provide alternatives
to Python's general purpose built-in containers, :class:`dict`, 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. dictionaries with string keys using the :meth:`bsddb.btopen` method.
In addition to containers, the collections module provides some ABCs 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 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 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 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 a way to create new instances from an iterable. The class constructor is
assumed to have a signature in the form ``ClassName(iterable)``. 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. :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 If the :class:`Set` mixin is being used in a class with a different
constructor signature, you will need to override :meth:`from_iterable` constructor signature, you will need to override :meth:`from_iterable`