[Zope-dev] Path expression traversal in z3c.pt
Hi,
I tried switching to z3c.pt in one of our projects and found an
incompatibility with zope.app.pagetemplate. It is not obvious whether
it is a bug or a feature, so I thought I should bring it up here.
Here is a doctest illustrating the incompatibility.
First, let's set up both types of templates:
from zope.pagetemplate.pagetemplate import PageTemplate
from zope.app.pagetemplate.engine import TrustedAppPT
class ZopePageTemplate(TrustedAppPT, PageTemplate):
... def __init__(self, source):
... self.pt_edit(source, '')
from z3c.pt.pagetemplate import PageTemplate as Z3CPageTemplate
from z3c.pt.expressions import path_translator
from zope.component import provideUtility
provideUtility(path_translator, name=path)
Normally, traversing in path expressions prefers attributes over
items, but makes an exception for dict objects.
arg = {'copy': 1}
ZopePageTemplate(p tal:content='options/arg/copy'/)(arg=arg)
u'p1/p\n'
Z3CPageTemplate(p tal:content='options/arg/copy'/)(arg=arg)
u'p1/p'
However, attribute lookup takes precedence for other dict-like objects:
from UserDict import UserDict
arg = UserDict()
arg['copy'] = '1'
ZopePageTemplate(p tal:content='options/arg/copy'/)(arg=arg)
up{'copy': '1'}/p\n
Z3CPageTemplate(p tal:content='options/arg/copy'/)(arg=arg)
up{'copy': '1'}/p
However, Zope lets the user override this behaviour by providing a
traversing adapter:
from zope.traversing.interfaces import ITraversable
from zope.interface import implements
class MyDict(UserDict):
... implements(ITraversable)
... def traverse(self, name, path):
... return self[name]
arg = MyDict()
arg['copy'] = '1'
ZopePageTemplate(p tal:content='options/arg/copy'/)(arg=arg)
u'p1/p\n'
Z3CPageTemplate(p tal:content='options/arg/copy'/)(arg=arg)
up{'copy': '1'}/p
Here the behaviour diverges, as
zope.app.pagetemplates.engine.ZopeTraverser looks for an ITraversable
adapter and gets DefaultTraversable to implement the default
behaviour, whereas z3c.pt.expressions.ZopeTraverser tries the
attribute lookup before looking up the adapter.
To summarize, z3c.pt prefers attribute lookup to traversable adapters,
whereas zope.app.pagetemplate doesn't.
Is this divergence a bug or a feature? Anyhow, it should be either
unified or documented.
Albertas
--
http://pov.lt -- ZTK/BlueBream consulting and development
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[Zope-dev] Zope Tests: 32 OK, 12 Failed, 3 Unknown
Summary of messages to the zope-tests list. Period Thu Sep 23 12:00:00 2010 UTC to Fri Sep 24 12:00:00 2010 UTC. There were 47 messages: 6 from Zope Tests, 4 from buildbot at pov.lt, 20 from buildbot at winbot.zope.org, 11 from ccomb at free.fr, 6 from jdriessen at thehealthagency.com. Test failures - Subject: FAILED : winbot / ztk_dev py_265_win32 From: buildbot at winbot.zope.org Date: Thu Sep 23 16:20:56 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020453.html Subject: FAILED : winbot / ztk_dev py_265_win64 From: buildbot at winbot.zope.org Date: Thu Sep 23 16:31:01 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020454.html Subject: FAILED : winbot / ztk_10 py_244_win32 From: buildbot at winbot.zope.org Date: Thu Sep 23 16:40:47 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020457.html Subject: FAILED : Zope Buildbot / zope2.12 slave-ubuntu64 From: jdriessen at thehealthagency.com Date: Thu Sep 23 16:52:12 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020460.html Subject: FAILED : Zope Buildbot / zope2 slave-ubuntu64 From: jdriessen at thehealthagency.com Date: Thu Sep 23 16:52:22 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020461.html Subject: FAILED : Zope Buildbot / ztk slave-ubuntu64 From: jdriessen at thehealthagency.com Date: Thu Sep 23 16:52:25 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020462.html Subject: FAILED : Zope Buildbot / zope2.12 slave-ubuntu32 From: jdriessen at thehealthagency.com Date: Thu Sep 23 16:52:35 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020463.html Subject: FAILED : Zope Buildbot / zope2 slave-ubuntu32 From: jdriessen at thehealthagency.com Date: Thu Sep 23 16:52:44 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020464.html Subject: FAILED : Zope Buildbot / ztk slave-ubuntu32 From: jdriessen at thehealthagency.com Date: Thu Sep 23 16:52:47 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020465.html Subject: FAILED : winbot / zc_buildout_dev py_244_win32 From: buildbot at winbot.zope.org Date: Thu Sep 23 17:16:34 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020467.html Subject: FAILED : winbot / zc_buildout_dev py_265_win64 From: buildbot at winbot.zope.org Date: Thu Sep 23 17:53:25 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020470.html Subject: FAILED : winbot / zc_buildout_dev py_270_win64 From: buildbot at winbot.zope.org Date: Thu Sep 23 18:19:59 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020472.html Unknown --- Subject: UNKNOWN : winbot / ztk_dev py_254_win32 From: buildbot at winbot.zope.org Date: Thu Sep 23 16:10:02 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020452.html Subject: UNKNOWN : winbot / ztk_dev py_270_win32 From: buildbot at winbot.zope.org Date: Thu Sep 23 16:31:02 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020455.html Subject: UNKNOWN : winbot / ztk_dev py_270_win64 From: buildbot at winbot.zope.org Date: Thu Sep 23 16:31:03 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020456.html Tests passed OK --- Subject: OK : winbot / ztk_10 py_254_win32 From: buildbot at winbot.zope.org Date: Thu Sep 23 16:49:10 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020458.html Subject: OK : winbot / ztk_10 py_265_win32 From: buildbot at winbot.zope.org Date: Thu Sep 23 16:57:03 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020459.html Subject: OK : winbot / ztk_10 py_265_win64 From: buildbot at winbot.zope.org Date: Thu Sep 23 17:05:15 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020466.html Subject: OK : winbot / zc_buildout_dev py_254_win32 From: buildbot at winbot.zope.org Date: Thu Sep 23 17:28:11 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020468.html Subject: OK : winbot / zc_buildout_dev py_265_win32 From: buildbot at winbot.zope.org Date: Thu Sep 23 17:40:53 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020469.html Subject: OK : winbot / zc_buildout_dev py_270_win32 From: buildbot at winbot.zope.org Date: Thu Sep 23 18:07:01 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020471.html Subject: OK : winbot / ZODB_dev py_254_win32 From: buildbot at winbot.zope.org Date: Thu Sep 23 19:15:52 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020473.html Subject: OK : ZTK 1.0 / Python2.4.6 Linux 64bit From: ccomb at free.fr Date: Thu Sep 23 19:41:41 EDT 2010 URL: http://mail.zope.org/pipermail/zope-tests/2010-September/020474.html Subject: OK : ZTK 1.0 / Python2.6.5 Linux 64bit From: ccomb at free.fr Date: Thu Sep 23 19:42:09 EDT 2010 URL:
[Zope-dev] Good news: ZODB will work with Python 2.7 (was Re: Heads up: ZODB probably won't work with Python 2.7)
On Fri, Sep 17, 2010 at 6:15 PM, Jim Fulton j...@zope.com wrote: I suspect that the shenanigans played by the ZODB persistent cache implementation is running afoul of some changes in the garbage collection implementation in Python 2.7. My suspicion was correct. :) See https://bugs.launchpad.net/zodb/+bug/641481 Fixed. The person reporting this was running a Python compiled in debug mode. This will sometimes detect subtle memory management bugs not detected with a normal build. ZODB's tests pass with a normal Python 2.7 build and with a debug Python 2.6 build. I've tracked one source of crash in a debug build to the cache's attempts to manage weak references to ghosts. Even hacking around this, there are other crashes that, I assume, are related. :( I'll dig further, but I strongly suspect that moving to Python 2.7 will require a cache reimplementation that uses real Python weak references. This won't happen in ZODB 3.10. Fortunately, the fix didn't require it. If there is anyone on this list who has knowledge of Python GC internals, I'd love to get some help. :) Thanks to Tim Peters for helping me figure out the fix. Jim -- Jim Fulton ___ Zope-Dev maillist - Zope-Dev@zope.org https://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - https://mail.zope.org/mailman/listinfo/zope-announce https://mail.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] Good news: ZODB will work with Python 2.7 (was Re: Heads up: ZODB probably won't work with Python 2.7)
On 09/24/2010 05:16 PM, Jim Fulton wrote: Thanks to Tim Peters for helping me figure out the fix. Cheers for Tim! :) -- Christian Theune · c...@gocept.com gocept gmbh co. kg · forsterstraße 29 · 06112 halle (saale) · germany http://gocept.com · tel +49 345 1229889 0 · fax +49 345 1229889 1 Zope and Plone consulting and development ___ Zope-Dev maillist - Zope-Dev@zope.org https://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - https://mail.zope.org/mailman/listinfo/zope-announce https://mail.zope.org/mailman/listinfo/zope )
[Zope-dev] Summary from the summit
Hi there, thanks again for everyone who joined the summit, I was happy to see so many of you come. The summit definitely had its ups and downs and the discussions continued even after when some of you joined us at the DZUG conference and even the sprints on the weekend after. I have compiled a summary from the index cards and notes and put it next to the organisational Wiki page: http://wiki.zope.org/ztk/ZopeSummit2010Summary Some of the ideas that were presented and some of the discussions that were started aren't concluded yet so use the summary as a reminder of what topics you'd like to continue talking about and then do so. :) Also, we have volunteers for individual goals. If you volunteered for something, please check back with the goal and help me write down the more specific agreements that were promised. Although we didn't come to a single grandiose conclusion, I'd like to point out that I personally (by continued discussion over the week) found ideas that I'd like to pursue in the future within the Zope community and thus have drawn energy from talking to you - I hope that you had at least a little bit of the same. Hope to see you all again soon, Christian PS: I don't want to be secretive about my ideas, but then again, I don't know how far I can develop the idea. It's basically about taking the ideas of the component architecture, decouple stuff from the web, separate the concerns more cleanly etc. In some discussions we dived down into more of the patterns and DDD community and I'm hoping to explore some of their good ideas (not the architecture astronaut ones) but that's a separate story from this post ... -- Christian Theune · c...@gocept.com gocept gmbh co. kg · forsterstraße 29 · 06112 halle (saale) · germany http://gocept.com · tel +49 345 1229889 0 · fax +49 345 1229889 1 Zope and Plone consulting and development ___ Zope-Dev maillist - Zope-Dev@zope.org https://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - https://mail.zope.org/mailman/listinfo/zope-announce https://mail.zope.org/mailman/listinfo/zope )
[Zope-dev] Developer meeting next Tuesday at 15:00 UTC
Good evening, another developer meeting is coming up next Tuesday at 15:00 UTC. During the meta-discussion this week Charlie mentioned that we really need to keep following up on the issues/goals/topics that were identified during the summit. So, before returning to pure maintenance topics and as the summary [1] is online now, I'll open up the next agenda to deal with the outcome of the summit. Hope to see you next week, Christian ___ Zope-Dev maillist - Zope-Dev@zope.org https://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - https://mail.zope.org/mailman/listinfo/zope-announce https://mail.zope.org/mailman/listinfo/zope )
