[mod_python] psp

Hello list,

I have a little problem with psp (I'm using psp as a template engine)

In one of my templates I have :
<input type="text" class="scientific_name" name="scientific_name" 
value="<%= invasive.scientific_name %>" />

The problem I have is that I'm using this form in different context and 
sometimes the 'invasive' object doesn't exists.
Is there a way to "display-only-if-object-exist" ? What I would like to 
avoid is things like :

<%
try:
    # BEGIN
%>
    <%= invasive.scientific_name %>
<%
    #END
except:
    #BEGIN
%>
blabla
<%
# NED
%>

I tried something like :

def show_if_defined(s, obj=globals()):
    for part in s.split('.') :
        if not hasattr(obj, part):
            return ''
        obj = getattr(obj, part)
    return obj

and
<input type="text" class="scientific_name" name="scientific_name" 
value="<%= show_if_defined('invasive.scientific_name') %>" />

but without success ...

Any idea ?

Thanks

-- 
Julien Cigar
Belgian Biodiversity Platform
http://www.biodiversity.be
Université Libre de Bruxelles
Campus de la Plaine CP 257
Bâtiment NO, Bureau 4 N4 115C (Niveau 4)
Boulevard du Triomphe, entrée ULB 2
B-1050 Bruxelles
office: jcigar at ulb.ac.be
home: mage at mordor.ath.cx