[Zope] Re: Problem with hasattr() and Zope 2.8.1

[Paul Winkler]

Doyon, Jean-Francois said:
> But then, why does this code work ok?
>
> class CrosslingualSupport:
>     """ Mix-in class to provide content objects with support for
>         cross-lingual properties when needed.
>     """
>
>     def clearCrosslingualAttributes(self, lang):
>         """ For a given language, remove all internal attributes related
> to
> it. """
>         for propertyname in [ propname for propname in
> self.__multilingualproperties__.keys() if
> self.__multilingualproperties__[propname][1] == True ]:
>             attname = '__' + propertyname + '_' + lang
>             if hasattr(self, attname): delattr(self, attname)
>
> As you see on the last line, I'm doing a hasattr() on an attribute who's
> name starts with 2 underscores, and it works fine in this case (has been
> for weeks, if not months).

But do those names *end* with underscores as well?
If so, Python doesn't mangle those names.
See: http://docs.python.org/ref/atom-identifiers.html

Also, what do you intend to communicate by naming
__multilingualproperties__ with the leading and trailing underscores?
Might want to read the style guide at
http://www.python.org/peps/pep-0008.html
if you haven't lately...  see the "Naming Conventions" section.

-- 
Paul Winkler
http://www.slinkp.com