[Zope] Using Zclasses

[Alexander Staubo]

Fyi, it is not documented in the Document Template Markup Language
User's Guide. Not all of us venture into the sources to find features we
don't see in the documentation, Michel.

--
Alexander Staubo             http://www.mop.no/~alex/
"What the hell, he thought, you're only young once, and threw
himself out of the window. That would at least keep the element of
surprise on his side."
--Douglas Adams, _The Hitchhiker's Guide to the Galaxy_

>-----Original Message-----
>From: Michel Pelletier [mailto:michel@digicool.com]
>Sent: 7. juli 1999 04:08
>To: 'Alexander Staubo'; Zope Mailing List (E-mail); 'Michael Bernstein'
>Subject: RE: [Zope] Using Zclasses
>
>
>> -----Original Message-----
>> From: Alexander Staubo [mailto:alex@mop.no]
>> Sent: Monday, July 05, 1999 10:28 PM
>> To: Zope Mailing List (E-mail); 'Michael Bernstein'
>> Subject: RE: [Zope] Using Zclasses
>>
>>
>> or something like that, assuming HasAttr() is an External Method that
>> tests for the existence of a property (I have not found this
>> functionality in Zope's built-in DTML API: The closest I you get is
>> getattr, which raises an error if it fails). I implement
>this function
>> like so::
>>
>>   def HasAttr(o, attr):
>>     return hasattr(o, attr)
>>
>
>The _ namespace has a hasattr.  Quote DocumentTemplate/DT_Util.py:
>
>  This variable also has attributes that provide access to standard
>  utility objects.  These attributes include:
>
>  - The objects: 'None', 'abs', 'chr', 'divmod', 'float', 'hash',
>       'hex', 'int', 'len', 'max', 'min', 'oct', 'ord', 'pow',
>       'round', and 'str' from the standard Python builtin module.
>
>  - Special security-aware versions of 'getattr' and 'hasattr',
>
>  - The Python 'string', 'math', and 'whrandom' modules, and
>
>  - A special function, 'test', that supports if-then expressions.
>    The 'test' function accepts any number of arguments.  If the
>    first argument is true, then the second argument is returned,
>    otherwise if the third argument is true, then the fourth
>    argument is returned, and so on.  If there is an odd number of
>    arguments, then the last argument is returned in the case that
>    none of the tested arguments is true, otherwise None is
>    returned.
>
>
>
>-Michel
>
>> --
>> Alexander Staubo             http://www.mop.no/~alex/
>> "What the hell, he thought, you're only young once, and threw
>> himself out of the window. That would at least keep the element of
>> surprise on his side."
>> --Douglas Adams, _The Hitchhiker's Guide to the Galaxy_
>>
>>
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>