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add ABC to the glossary

This commit is contained in:
Benjamin Peterson 2008-07-01 23:33:06 +00:00
parent aa76d77e2b
commit aac51b8a69
2 changed files with 16 additions and 7 deletions
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15
Doc/glossary.rst
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@ -24,6 +24,14 @@ Glossary
2to3 is available in the standard library as :mod:`lib2to3`; a standalone
entry point is provided as :file:`Tools/scripts/2to3`.
Abstract Base Class
Abstract Base Classes (abbreviated ABCs) complement :term:`duck-typing` by
providing a way to define interfaces when other techniques like :func:`hasattr`
would be clumsy. Python comes with many builtin ABCs for data structures
(in the :mod:`collections` module), numbers (in the :mod:`numbers`
module), and streams (in the :mod:`io` module). You can create your own
ABC with the :mod:`abc` module.
argument
A value passed to a function or method, assigned to a name local to
the body. A function or method may have both positional arguments and
@ -116,15 +124,16 @@ Glossary
be any object with a :meth:`__hash__` function, not just integers starting
from zero. Called a hash in Perl.
duck-typing
duck-typing
Pythonic programming style that determines an object's type by inspection
of its method or attribute signature rather than by explicit relationship
to some type object ("If it looks like a duck and quacks like a duck, it
must be a duck.") By emphasizing interfaces rather than specific types,
well-designed code improves its flexibility by allowing polymorphic
substitution. Duck-typing avoids tests using :func:`type` or
:func:`isinstance`. Instead, it typically employs :func:`hasattr` tests or
:term:`EAFP` programming.
:func:`isinstance`. (Note, however, that duck-typing can be complemented
with abstract base classes.) Instead, it typically employs :func:`hasattr`
tests or :term:`EAFP` programming.
EAFP
Easier to ask for forgiveness than permission. This common Python coding

8
Doc/library/abc.rst
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@ -9,10 +9,10 @@
.. versionadded:: 2.6
This module provides the infrastructure for defining abstract base classes
(ABCs) in Python, as outlined in :pep:`3119`; see the PEP for why this was added
to Python. (See also :pep:`3141` and the :mod:`numbers` module regarding a type
hierarchy for numbers based on ABCs.)
This module provides the infrastructure for defining :term:`abstract base
classes` (ABCs) in Python, as outlined in :pep:`3119`; see the PEP for why this
was added to Python. (See also :pep:`3141` and the :mod:`numbers` module
regarding a type hierarchy for numbers based on ABCs.)
The :mod:`collections` module has some concrete classes that derive from
ABCs; these can, of course, be further derived. In addition the