En Sat, 17 Jan 2009 08:16:14 -0200, Dragos <dragosmoc...@gmail.com>
escribió:
On Jan 17, 11:48 am, "Gabriel Genellina" <gagsl-...@yahoo.com.ar>
wrote:
En Fri, 16 Jan 2009 17:19:47 -0200, escribiste en el grupo
gmane.comp.python.general
> I am trying to make a testing script to load/save cookies to a file
> with FileCookieJar, but it results in this error: FileCookieJar has
> not attribute "_self_load"
FileCookieJar is an abstract class, although it isn't clear at all from
the documentation. (You may want to file a documentation bug
athttp://bugs.python.org)
You must instantiate a specific subclass (like MozillaCookieJar), which
determines the actual file format used.
Oh, thank you so much.
Using MozillaCookieJar works just fine.
But could you please explain what an abstract class is (or where i can
find documentation for this term). Thanks!
Try http://en.wikipedia.org/wiki/Abstract_class
In short, it's an incomplete class, with "holes" that subclasses must fill
in order to get a complete, working class (a "concrete" class, as opposed
to the "abstract" base).
If you look at FileCookieJar, its load() method calls self._really_load
but no such method exists in that class nor its ancestors (this explains
the error you got). Subclasses of FileCookieJar *must* implement
_really_load to be usable.
It's customary to define the method anyway, and raise NotImplementedError;
this serves two purposes:
- document the expected interfase
- error messages are more meaningful
(FileCookieJar.save() is implemented this way; _really_load() should be
the same)
--
Gabriel Genellina
--
http://mail.python.org/mailman/listinfo/python-list
