Hector G writes:
i'm new qith zope and i was trynig to study dtml with the dtml guide ,but i don'u understand when is necesary to use "_" and when"_."
And i don't understan when : gatattr(O,name)
Seems you want some background reading.... Look at the Zope book or <http://www.dieter.handshake.de/pyprojects/zope/book/chap3.html> "_", the DTML namespace, behaves both like an object with attributes and like a mapping. You use the attribute access syntax, "obj.attr", when you want to access attribute "attr" of object "obj". If the "attr" is not a constant name but an expression, you would use "getattr(obj,attr)". The attributes of "_" are described in the Zope online help --> Zope Help --> DTML Reference --> "functions". A mapping maps keys to values. You use the subscription syntax, "map[key]", to access the value associated with "key". The mapping "_" maps all the (currently) defined variables, the attributes of the current object and its acquired attributes and the request variables (this is a simplified explanation; read the mentioned resources to get a clearer picture). Thus, you use "_[name]" to access the value currently bound to "name". If "name" is constant, you can (often) simply use "name". This is not equivalent (read the resources....), however! Dieter