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Clarify example; add imports

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Andrew M. Kuchling 2008-09-02 13:06:00 +00:00
parent 31a0a1478b
commit 8315da4c17
1 changed files with 10 additions and 4 deletions
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14
Doc/whatsnew/2.6.rst
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@ -1224,7 +1224,7 @@ do it where it's absolutely necessary.
You can write your own ABCs by using ``abc.ABCMeta`` as the You can write your own ABCs by using ``abc.ABCMeta`` as the
metaclass in a class definition:: metaclass in a class definition::
from abc import ABCMeta from abc import ABCMeta, abstractmethod
class Drawable(): class Drawable():
__metaclass__ = ABCMeta __metaclass__ = ABCMeta
@ -1256,15 +1256,21 @@ exception for classes that don't define the method.
Note that the exception is only raised when you actually Note that the exception is only raised when you actually
try to create an instance of a subclass lacking the method:: try to create an instance of a subclass lacking the method::
>>> s=Square() >>> class Circle(Drawable):
... pass
...
>>> c=Circle()
Traceback (most recent call last): Traceback (most recent call last):
File "<stdin>", line 1, in <module> File "<stdin>", line 1, in <module>
TypeError: Can't instantiate abstract class Square with abstract methods draw TypeError: Can't instantiate abstract class Circle with abstract methods draw
>>> >>>
Abstract data attributes can be declared using the Abstract data attributes can be declared using the
``@abstractproperty`` decorator:: ``@abstractproperty`` decorator::
from abc import abstractproperty
...
@abstractproperty @abstractproperty
def readonly(self): def readonly(self):
return self._x return self._x
@ -3206,5 +3212,5 @@ Acknowledgements
The author would like to thank the following people for offering suggestions, The author would like to thank the following people for offering suggestions,
corrections and assistance with various drafts of this article: corrections and assistance with various drafts of this article:
Georg Brandl, Nick Coghlan, Jim Jewett, Antoine Pitrou. Georg Brandl, Steve Brown, Nick Coghlan, Jim Jewett, Antoine Pitrou.