[Zope] External method default arg weirdness
Wed, 9 May 2001 22:02:19 +0200 (CEST)
Paul Winkler writes:
> Uhhh... duh, you're right. The methods I was actually using have
> "self" as first parameter.
> But I don't understand why that affects the rest of the
> parameters??? Very un-pythonic.
I agree. The more modern Python scripts solve the same problem
The motivation for this "feature":
Often External Methods should behave like methods.
Sometimes, they should not.
The implementers used the following heuristics to distinguish
between these two cases:
First, it is tried to call the method with the parameters
provided. If this raises a "TypeError" and the
first parameter is called "self", then the
call is retried, this time with "aq_parent" as first
This magic works only, if the method is called with
precisely one parameter less then the required
arguments. It breaks very likely, when there are
default parameters. In this case, you need to pass
the "self" parameter explicitly and can not count on