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Questions tagged [zope.component]

The zope.component package implements the core functionality of the Zope Component Architecture (ZCA).

The Zope Component Architecture lets you register and retrieve independent components, that together make a flexible component-based system.

Components are reusable Python objects with introspectable interfaces (implemented using ). Using zope.component lets you define utilities, adapters and subscribers, which together let you build large-scale Python software while decoupling disparate parts and implementations.

See A Comprehensive Guide to Zope Component Architecture for more details.

19 questions
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Mocking ImportError in Python

I'm trying this for almost two hours now, without any luck. I have a module that looks like this: try: from zope.component import queryUtility # and things like this except ImportError: # do some fallback operations <-- how to test…
Attila O.
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Python, Zope Component Architecture, Registering an adapter

In a stand-alone python application I use zope.interface, zope.component packages to register and access application's adapters. I thought I could use metaclass concept to register adapters from inside init method of the metaclass. This would…
Alex Kotliarov
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Does a Zope Component Architecture component need to state the interfaces it implements?

Note: I am new to ZCA, so the code may be incorrect; however, I am somewhat familiar with the way ZCA works. Given for example: class I1(Interface): def c1(): pass class U1(object): implements(I1) #is this necessary? def c1(): …
Abbafei
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Create a reusable component with ZCA and SQLAlchemy

Actually i'm designing a large application for desktop with python 3.4. I choosed the Port and Adapter architecture as know as Hexagonal architecture. The main purpose it to work with reusable component. To organize the code and put some rules we…
PyNico
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Manipulating cookies after sending response on Plone 4.3

I need to change data stored inside cookies, or set new cookies when a user access a Plone URL. The official Plone documentation contains exactly what I need in the Modifying HTTP response cookies section. Unluckily it seems to be a deprecated…
keul
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How to get "cast like" adaption to work with pure zope.interface?

I would like to get the "C++ cast like" adaption to work with the code from zope.interface. In my real use case, I'm using a registry from Pyramid but it derives from zope.interface.registry.Components, which according to the changes.txt was…
Achim
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What is the difference between a Zope utility defined with a factory versus a component?

It's a little confusing that ZCML registrations for Zope utilities can accept a component or a factory. versus What is the difference?
joeforker
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Issue with zope.component subscriber adapters adapting multiple objects

Given the following code: from zope.component import getGlobalSiteManager, adapts, subscribers from zope.interface import Interface, implements class A(object): pass class B(object): pass class C(B): pass class AB(object): …
Ben
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Providing backward compatibility for a zope component

I'm working on a new release of collective.imagetags in which all the functionality that was carried by a browser view (imagetags-manage) is now moved to a new adapter (not commited yet) which provides almost the same interface that the browser…
marcosfromero
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Change Zope2 browser resourceDirectory permission to allow only Authenticated users

I have a browser:resourceDirectory setup in Zope2 and I have: permission="zope2.Public". what should be changed in order to allow only "Authenticated" users access to the resource directory?
userisnew
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Plone/Zope style view overrides in Pyramid

I have Add-on product defining a view ("my_view") Application using this addon Both application views.py are scanned by configurator during the application startup. My application needs to have a more specific version of my_view, as addon…
Mikko Ohtamaa
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zope.annotation example in documentation fails. Help needed to correct it

I am trying to understand Annotations from this document: http://docs.zope.org/zope.annotation/index.html However the example fails when run. I get: Traceback (most recent call last): File "./zopepy", line 366, in …
sureshvv
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In Python Zope, how do I dump the error_log to the browser?

We are a big org and we use Python Zope. We have naturally two versions: prod and dev. In production I understand due to security reasons we should not show error log to end users, but how do I do that for dev? It is very cumbersome to check the…
João Pimentel Ferreira
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Why is my MultiAdapter failing to register?

I'm currently experimenting with the ZCA and I've run into a bit of a hitch. The script below defines an IFuncttion interface, which is used to create function objects that can be chained (i.e. monads). In this example, I'm trying to create a…
Louis Thibault
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How to make zope load my ZCML?

When I write some utility, register it and then query with getUtility it works ok: class IOperation(Interface): def __call__(a, b): ''' performs operation on two operands ''' class Plus(object): implements(IOperation) def…
Bunyk
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