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Link isinstance/issubclass to the ABC glossary entry (#12256)

This commit is contained in:
Éric Araujo 2011-08-19 09:15:47 +02:00
parent f06568cbd8
commit e0054c51c7
2 changed files with 10 additions and 4 deletions
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5
Doc/glossary.rst
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@ -30,7 +30,10 @@ Glossary
Abstract base classes complement :term:`duck-typing` by
providing a way to define interfaces when other techniques like
:func:`hasattr` would be clumsy or subtly wrong (for example with
:ref:`magic methods <new-style-special-lookup>`). Python comes with many built-in ABCs for
:ref:`magic methods <new-style-special-lookup>`). ABCs introduce virtual
subclasses, which are classes that don't inherit from a class but are
still recognized by :func:`isinstance` and :func:`issubclass`; see the
:mod:`abc` module documentation. Python comes with many built-in 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 ABCs with the :mod:`abc` module.

9
Doc/library/functions.rst
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@ -624,9 +624,11 @@ available. They are listed here in alphabetical order.
.. function:: isinstance(object, classinfo)
Return true if the *object* argument is an instance of the *classinfo* argument,
or of a (direct or indirect) subclass thereof. Also return true if *classinfo*
or of a (direct, indirect or :term:`virtual <abstract base class>`) subclass
thereof. Also return true if *classinfo*
is a type object (new-style class) and *object* is an object of that type or of
a (direct or indirect) subclass thereof. If *object* is not a class instance or
a (direct, indirect or :term:`virtual <abstract base class>`) subclass
thereof. If *object* is not a class instance or
an object of the given type, the function always returns false. If *classinfo*
is neither a class object nor a type object, it may be a tuple of class or type
objects, or may recursively contain other such tuples (other sequence types are
@ -639,7 +641,8 @@ available. They are listed here in alphabetical order.
.. function:: issubclass(class, classinfo)
Return true if *class* is a subclass (direct or indirect) of *classinfo*. A
Return true if *class* is a subclass (direct, indirect or :term:`virtual
<abstract base class>`) of *classinfo*. A
class is considered a subclass of itself. *classinfo* may be a tuple of class
objects, in which case every entry in *classinfo* will be checked. In any other
case, a :exc:`TypeError` exception is raised.