[ZODB-Dev] unable to import ZODB: class ConflictError, AttributeError

[Alexandre Garel]

Le 14/06/2012 10:06, Ralf Hauenschild a écrit :
> Am 14.06.2012 09:18, schrieb Marius Gedminas:
>> On Wed, Jun 13, 2012 at 10:58:01PM +0200, Ralf Hauenschild wrote:
>>> Am 13.06.2012 19:36, schrieb Alexandre Garel:
>>>> Le 13/06/2012 18:57, Ralf Hauenschild a écrit :
>>>>> Hello guys,
>>>>>
>>>>> i've been desperately trying to install ZODB3 via the following ways:
>>>>> - easy_install ZODB3
>>>>> - installation of Zope2
>>>>> - manual installation of ZODB3, preceeded by installation of the
>>>>> requested packages from pypi
>>>>>
>>>>> I'm using Ubuntu and Python 2.6.
>>>>>
>>>>> Whe trying to import ZODB, I'm still getting the following error:
>>>>>
>>>>>
>>>>> python
>>>>> Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41)
>>>>> [GCC 4.4.3] on linux2
>>>>> Type "help", "copyright", "credits" or "license" for more information.
>>>>>>>> import ZODB
>>>>> Traceback (most recent call last):
>>>>>   File "<stdin>", line 1, in<module>
>>>>>   File "/usr/local/lib/python2.6/dist-packages/ZODB3-3.10.5-py2.6-linux-x86_64.egg/ZODB/__init__.py",
>>>>> line 28, in<module>
>>>>>     from DB import DB, connection
>>>>>   File "/usr/local/lib/python2.6/dist-packages/ZODB3-3.10.5-py2.6-linux-x86_64.egg/ZODB/DB.py",
>>>>> line 28, in<module>
>>>>>     from ZODB.Connection import Connection
>>>>>   File "/usr/local/lib/python2.6/dist-packages/ZODB3-3.10.5-py2.6-linux-x86_64.egg/ZODB/Connection.py",
>>>>> line 33, in<module>
>>>>>     from ZODB.blob import Blob, rename_or_copy_blob,
>>>>> remove_committed_dir
>>>>>   File "/usr/local/lib/python2.6/dist-packages/ZODB3-3.10.5-py2.6-linux-x86_64.egg/ZODB/blob.py",
>>>>> line 35, in<module>
>>>>>     from ZODB.POSException import POSKeyError
>>>>>   File "/usr/local/lib/python2.6/dist-packages/ZODB3-3.10.5-py2.6-linux-x86_64.egg/ZODB/POSException.py",
>>>>> line 71, in<module>
>>>>>     class ConflictError(POSError,
>>>>> transaction.interfaces.TransientError):
>>>>> AttributeError: 'module' object has no attribute 'TransientError'
>> You need a newer version of the 'transaction' package.  Unfortunately
>> the changelog athttp://pypi.python.org/pypi/transaction  doesn't say
>> which version added TransientError, but why not get the latest one?
>>
>>>>> Can anybody help me, please?
>>>> The problem may be  with a system wide installed version of transaction.
>>>>
>>>> I would say, try in a virtualenv with no site packages :
>>>>
>>>> $ virtualenv -p /usr/bin/python2.6 --no-site-packages myproject
>>>> $ cd myproject
>>>> $ . bin/activate
>>>> $ pip install ZODB3
>>>>
>>>> Hope this helps,
>>> Unfortunately, the error remains :(

You mean in the global python ? For sure ! My goal was to make it work 
in the virtualenv.


[-- snip --]
> Any further ideas?
> Python path is set in the global environment. In the virtualenv, it 
> was not set, but everything worked there anyway.

You have a non compatible version of transaction installed globally, so 
you won't run ZODB3 with your global environment. So Install / develop 
your software  in the isolated virtualenv. Is there a problem with that ?

If you need it for system script, the shebang just have to use the 
virtualenv python interpreter : #! /path/to/virtualenv/bin/python.

Regards,
Alex


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