[Zope] basic python class & zope question

[Winterflood, Jonathan]

> De : zope-bounces at zope.org [mailto:zope-bounces at zope.org] De la part de 
> Tudor Gabriel
> Envoyé : mercredi 13 juin 2007 01:54
> À : zope at zope.org
> Objet : [Zope] basic python class & zope question
> 
> hi im new here , first post ... and new to zope.
> 
> i've read the manual ... and zope framework looks very promising ... 
> i started writing a couple of templates ... and run into some basic 
> problems like:
> 
> Problem 1.
> is it posible to have a python class ... defined in a script .... like
> class learn:
>    def print_something(self):
>       print 'it works'
> 
> 
> and call it from zpt ... like <span 
> tal:replace="learn/print_something">replace</span>? 
> 
> or how can i call a method from this object ? ... i tryied with 
> python:learn.print_something() and many different ways and i still 
> don't get it.
> 
> i'm starting to suspect that i can use classes only as zope products .... 
> and call from zpt ... only scripts without classes.
> 
> also do i have to set the properties/attributes of the script which 
> contains the class ... with the methods?
> 
> because by calling learn/print_somthing i get an AttributeError ... url 
> might be invalid etc... 
> 
> Problem 2.
> 
> how can i call/return from an python script a html file which resides in 
> some folder above the script.
> 
> i wanna call abc/index.html ... from abc/def/script.py
> 
> i tryied with the container[' index.html'[ but it doesn't return anything.
> 
> thank you for the patience and sorry for the very basic questions ... but 
> i feel that if i understand this things ... i can really get started with
> zope.
>

Hi,

> or how can i call a method from this object ?
To call a method of a class, you first have to possess an instance of that class in a variable. Then, supporing the variable is lrn_instance, you can use lrn_instance/print_something or python:lrn_instance.print_something() to call it.

> is it posible to have a python class ... defined in a script
....
> because by calling learn/print_somthing i get an AttributeError
It should be possible to define a class in a script, but the script won't become that class, you will have to have that script return an instance of the class, and then you store it somewhere (a variable maybe, or a property of some other object if you want it to persist). As far as I can tell, it would probably be wiser to define the class in a Product, though.

> how can i call/return from an python script a html file which resides...
This behaviour is built into Zope and is called acquisition: anything defined above your context is accessible as if it were in your context, as long as it isn't obscured by something else with the same name.

The things you want to access will lose their extension, by the way: index_html.pt will become index_html, the same way that script.py becomes script

>From abc/def/script.py, "context.index_html()" should give you the rendering of abc/index_html.whatever_it_is


Hope this helps,
Jonathan

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