Hi everybody, I'm struggling with some concepts in Zope. The last one is the DocumentTemplate.HTMLFIle behavior. I was trying to run the Zen 'The (old) Product API Tutorial' examples when I came accross with this line of code that looked strange for me (maybe I don't know python enough): index_html = DocumentTemplate.HTMLFile('poll2.dtml') ... p = Poll("What's for breakfast?", ['spam', 'eggs', 'toast']) print p.index_html(p) ------------------^^^ It worked fine and rendered my form. But what looked strange to me was to give p as an argument. So I tried p.index_html: it gave me the dtml file (with < for < and so on). So fine depending on whether or not you provide an argument the rendering is different. I tried to read the sources to understand better that behavior. I read somethings about passing mapping object or keywords arguments. But the question is: As p.index_html is a DocumentTemplate.HTMLFile instance why can we provide it with arguments like if it were a method or if we were instantiating a class?