[Zope] RE: Importing Products into my Custom Product....

[Paul Winkler]

On Sat, Sep 11, 2004 at 11:52:16AM -0700, Bill Hewitt wrote:
> I  am asking this question again in hopes that maybe this time it will
> make more sense....
> 
> What I want to do is reuse code from one product to the next in a Python
> Class...... This is trivial in a ZClass, but ????
> 
> Anyway, I create a new Python Product "FOO" and I want to import the
> methods of another Python Product "Bar" ("FOO" and "BAR" are next to
> each other in the Products Directory), so I add 
> "import Bar" into my __init__.py file for "FO0"

Two points here:
1) You're mixing different capitalization styles. You might 
get away with that on Windows but it will bite you
on any case-sensitive platform...

2) You don't need to import Bar in Foo's __init__.py,
you should instead put your imports in whatever module 
of Foo actually needs to call methods from Bar. See below for
how to do this.
 
> When I do this, the ZServer complains that the module does not
> exist..... So, I try:
> "from Bar import Bar" and "from Bar.Bar import Bar" and "from
> Products.Bar import Bar"

The latter should work, so something must be wrong.
Here's a working example of the CMFDefault product importing 
something from the CMFCore product:

from Products.CMFCore.CMFCorePermissions import View

This works because the following conditions are satisfied:

1) CMFCore is a proper package: i.e. it must
have an __init__.py file.

2) CMFCore is placed in the Products directory.

3) CMFCore/CMFCorePermissions.py must exist.

4) CMFCorePermissions.py must have a module-level 
name View.

 
-- 

Paul Winkler
http://www.slinkp.com