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Parameter referencing bug in Python Scripts?
by Brian Brinegar 22 Mar '04

22 Mar '04

Hmmm, There seems to be a bug in the way parameters are referenced in python scripts. I have a simple script that has a list as a default parameter. The script then appends something to this list and returns the list. Each time I call the script the list gets to be one element longer. Here is an example script: ## Script (Python) "pyFix" ##bind container=container ##bind context=context ##bind namespace= ##bind script=script ##bind subpath=traverse_subpath ##parameters=a=['a'] ##title= ## a.append('b') return a The output from the script is as follows: 1st call: ['a','b'] 2nd call: ['a','b','b'] 3rd call: ['a','b','b','b'] 4th call: ['a','b','b','b','b'] etc. It seems that I'm getting a reference to the default parameter which I then modify for future calls. Currently I'm getting around this by having list parameters default to none and then setting the defaults within the script. I have some security concerns since I can change the default parameters for other users on the server. Or so it seems. Suggestions? Brian Brinegar Engineering Computer Network Purdue University

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Bug in ZTUtil.Batch solved
by AP Meyer 22 Mar '04

22 Mar '04

Hi Zopers It seems that there is a bug in ZTUtil.Batch: when the batch should be the length of the batch and there are exactly as many orphans as there would fit on one page the length of the batch becomes size instead of size+orphans. Here are the numbers: no of batches start end orphan length sequence_length 1 1 12 3 12 12 1 1 10 3 10 13 <<< WRONG * 2 1 10 3 10 14 * end and length should be 13 in this case, 3 items are omitted length=12 length=13 length=14 1 1 1 2 2 2 3 3 3 4 4 4 5 5 5 6 6 6 7 7 7 8 8 8 9 9 9 10 10 10 11 11 | second batch 12 12 | 13 | 14 | So, there is a jump on the edge where there should be one batch of the length sequence_length == length+orphans. At that point 3 (in the above case) items disappear. I have looked at the code in ZTUtils.Batch.py and found the following solution (line 109): 94 def opt(start,end,size,orphan,sequence): 95 if size < 1: 96 if start > 0 and end > 0 and end >= start: 97 size=end+1-start 98 else: size=7 99 100 if start > 0: 101 102 try: sequence[start-1] 103 except IndexError: start=len(sequence) 104 105 if end > 0: 106 if end < start: end=start 107 else: 108 end=start+size-1 109 #try: sequence[end+orphan-1] 110 try: sequence[end+orphan] # replace above with this 111 except IndexError: end=len(sequence) 112 ... Can somebody confirm that this solution is correct and modify it in the CVS, please? NB This has been run in Zope 2.7 with Python 2.3.3. thanks Andre -- ------------------------------------------------------------------------------ The disclaimer that applies to e-mail from TNO Physics and Electronics Laboratory can be found on: http://www.tno.nl/disclaimer/email.html ------------------------------------------------------------------------------

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[Problem] unordered entries in "Z2.log"
by Dieter Maurer 22 Mar '04

22 Mar '04

Apparently, entries in Zope's "Z2.log" are not chronologically (by causuality) ordered. In my concrete case, a form was POSTed that resulted in a redirected "GET" request. The entries in "Z2.log", however, were in the order: GET ... 200 POST ... 302 This can be confusing (altough, I do not know whether it can be easily avoided). -- Dieter

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strange path
by Garito 21 Mar '04

21 Mar '04

Hi on a ZPT I put a here/absolute_url and these is the response: http://localhost:8080/Plantillas/Pruebas/Objetos///Minima the correct path would be: http://localhost:8080/Plantillas/Pruebas/Objetos/Concepto/Vistas/Minima What's happening here? TIA

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help
by Vandana Bajaj 19 Mar '04

19 Mar '04

Hi I installed zope2.7.0 on SUSE Linux as a non root user(vandana) and psycopg1.11.... All steps of installation were successful, accept for the 'make install-zope' step. But when i try to use psycopg to connect to the database on the local machine Zope asks me for a username and password. Where even if i give the username and password with which i installed zope(i.e vandana) , it does not accpet it. The same thing happens with 'root' username and password. Can some one please guide me how to access system resources through zope. Thanking you in advance. Vandana Do you Yahoo!? Yahoo! Mail - More reliable, more storage, less spam

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Security declarations vanish over time?!
by Chris Withers 18 Mar '04

18 Mar '04

Hi there, I have a little help class: class NamesProxy: __allow_access_to_unprotected_subobjects__=1 def __init__(self,names): self.names=names def __getitem__(self,item): return self.names[item] def __len__(self): return len(self.names) ...which lets me do batches over .objectValues() of BTreeFolders without ZOpe's security whining. Any, so that I can do: <tal:x define="Batch nocall:modules/ZTUtils/Batch; NamesProxy nocall:modules/Products/MyProduct/NamesProxy;"> ...I have the following in MyProduct's __init__.py: from AccessControl import ModuleSecurityInfo ModuleSecurityInfo('Products').declarePublic('MyProduct') security = ModuleSecurityInfo() # make NamesProxy usable from PageTemplates from namesproxy import NamesProxy security.declarePublic('NamesProxy') security.apply(globals()) ...all well and good, yes? Okay, now it gets weird :-S This works fine for a while (as in period of time) and then you start getting errors of the following sort: File /usr/local/zope/2.6.1/lib/python/Products/PageTemplates/TALES.py, line 217, in evaluate File /usr/local/zope/2.6.1/lib/python/Products/PageTemplates/Expressions.py, line 206, in __call__ File /usr/local/zope/2.6.1/lib/python/Products/PageTemplates/Expressions.py, line 194, in _eval File /usr/local/zope/2.6.1/lib/python/Products/PageTemplates/Expressions.py, line 150, in _eval (Info: modules) File /usr/local/zope/2.6.1/lib/python/Products/PageTemplates/Expressions.py, line 346, in restrictedTraverse (Object: Products.ScreenDigest) (Info: {'path': ['Products', 'MyProduct', 'NamesProxy'], 'TraversalRequestNameStack': []}) Unauthorized: You are not allowed to access NamesProxy in this context What gives? Weirder still, this can be fixed by restarting Zope... until the next time it starts doing it :-( Any ideas? Chris -- Simplistix - Content Management, Zope & Python Consulting - http://www.simplistix.co.uk

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Re: Thanks :)
by Zope＠zope.org 18 Mar '04

18 Mar '04

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Stop Testing from changing INSTANCE_HOME (proposed solution)
by Stefan H. Holek 17 Mar '04

17 Mar '04

I believe I have found an elegant way to stop 'import Testing' from changing the INSTANCE_HOME. Please see: http://zope.org/Collectors/Zope/1260 Stefan -- The time has come to start talking about whether the emperor is as well dressed as we are supposed to think he is. /Pete McBreen/

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built-in 'dict' and 'list' in PythonScripts
by Andreas Jung 17 Mar '04

17 Mar '04

The built-ins 'dict' and 'list' are not what they supposed to be in a Python environment: print isinstance('foo', dict) return printed will raise a TypeError because 'dict' represents an instance of ZopeGuards.GuardedDictType. This behaviour is confusing if you are not aware of it. At least the documentation of PythonScripts should be updated to reflect the differences. -aj -- Andreas Jung -------------------------------- www.zopyx.com Software-Entwicklung und Consulting Andreas Jung

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test.py
by Evan Simpson 16 Mar '04

16 Mar '04

Jeremy Hylton wrote: > Make sure App.Product is imported first, so that test.py can work. > > This change does not affect the old utilities/testrunner.py. This checkin message caused me to notice 'test.py' for the first time. Can you point me to any discussion/docs on it? When did/will it replace testrunner? Shouldn't the python2.2 in the "#!" line be python2.3? Sorry for the flood of questions, but this and the recent doctest-style tests being checked in have made me wonder if I've been missing a significant shift in testing tech. Cheers, Evan @ 4-am

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