[Zope] Tricky (I think!) external method question...
Tue, 30 Oct 2001 11:35:59 -0800
This is a python error __init__ should always return None.
>>> class a:
... def __init__(self):
... return 1
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: __init__() should return None
----- Original Message -----
From: "Steven Sartorius" <email@example.com>
Sent: Tuesday, October 30, 2001 11:14 AM
Subject: [Zope] Tricky (I think!) external method question...
> I'm a relatively experienced python programmer who's just recently gotten
> into Zope. I've downloaded the pdf of 'The Zope Book' and looked through
> the various How-To's but I'm stuck on the following problem:
> Starting from the top....
> I have a DTML Document which is essentially a simple data input form. The
> 'ACTION' attribute of the 'FORM' statement calls a python Script to clean
> and format the data. As part of this, the Script calls a number of
> Methods, all of which are written in python. I do this by using the
> 'container' binding (e.g. x = container.myExternalMethod()). Some of
> External Methods in turn import various .py files from my personal python
> directory which is totally separate and apart from where Zope/Extensions
> lives in the filesystem. In general all this works -- I get the results I
> expect. My problem comes from the one External Method that imports a .py
> file that contains a subclassed Class. The External Method looks like
> import MySubClass
> def aFunction(self,a,b,c):
> d = MySubClass.MySubClass(a,b,c)
> return d
> MySubClass in turn looks like this:
> import MyClass
> class MySubClass(MyClass.MyClass):
> def __init__(self,a,b,c):
> """Do some initialization that differs from MyClass"""
> return d
> The External Method above dies when it tries to create 'd'. The traceback
> get from Zope says:
> Error Type: TypeError
> Error Value: __init__() should return None
> I'm stumped by this. I think there is some sort of namespace confusion
> going on but I'm not sure. If anyone can shed any light on this (and save
> some of my hair!) I'd appreciate it.
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