[Zope] Why 'unbound method' error?

[peter sabaini]

this is a common problem, see
http://debian.acm.ndsu.nodak.edu/doc/python-extclass/ExtensionClass.html
for a description (search for 'inheritedAttribute')

hth, peter.

Warnes, Gregory R wrote:
> I've just modified a python product and I've started getting an error that
> doesn't make sense to me.
> 
> Here's the error message:
> 
> Error Type: TypeError
> Error Value: unbound method connect() must be called with instance as first
> argument
> [...]
>  File
> /Volumes/app/appman/lib/zope/Zope-2.5.1-solaris-2.6-sparc/Products/RSessionD
> A/RSessionDA.py, line 213, in putFile
>     (Object: RSession)
>   File
> /Volumes/app/appman/lib/zope/Zope-2.5.1-solaris-2.6-sparc/Products/RSessionD
> A/RSOAP/localRSOAPConnection.py, line 124, in uploadFile
>     (Object: RSession)
>   File
> /Volumes/app/appman/lib/zope/Zope-2.5.1-solaris-2.6-sparc/Products/RSessionD
> A/RSOAP/localRSOAPConnection.py, line 49, in connect
>     (Object: RSession)
> TypeError: (see above)
> 
> and the 'offending' code:
> 
> class RSession(localRSOAPConnection, SimpleItem):
>     '''Connection object to the R Kernel'''
> 
>      # no connect method defined here ... #
>     ....
> 
> class localRSOAPConnection(RSOAPConnection):
> 
>     def connect(self):
>         flag = RSOAPConnection.connect(self)
> 
>         if flag:
>             self.__checklocal()
> 
>         return flag
> 
>      ....
> 
> 
> The localRSOAPConnection code works just fine in standalone Python.    In
> Zope the localRSOAPConnection is extended by RSession with methods that are
> Zope-aware.  
> 
> My question is why is the call to 'connect' failing in Zope?    I am passing
> a valid instance with the self argument...
> 
> Ideas appreciated...
> 
> -Greg
> 
> 
> 
> 
> 
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