The Python pickler cannot pickle module objects. You might try the same concept, but with class objects instead. On Sun, 29 Jul 2001 20:20:28 -0400 Joseph Barillari <jbarilla@princeton.edu> wrote:
Hello,
I'm having trouble storing to the ZODB.
The code in question reads a string argument and selects a module from the current directory that matches the string argument, importing it into the current class:
class Division(Persistence.Persistent): "A collection of rounds." def __init__(self, name, type, flags = []): self.name = name self.typename = type self.rules = __import__(type) self.rounds = [] self.teams = {} self.judges = [] self.flags = flags
(rest of class snipped in the interests of brevity)
Here's the result of a call using the arguments ('Test', 'APDA') in Python 1.5.2 and Zope 2.4.0
Traceback (innermost last): File "<stdin>", line 1, in ? File "t3s.py", line 909, in add_division get_transaction().commit() File "/usr/lib/python1.5/ZODB/Transaction.py", line 300, in commit j.commit(o,self) File "/usr/lib/python1.5/ZODB/Connection.py", line 375, in commit dump(state) cPickle.UnpickleableError: Cannot pickle <type 'module'> objects
(add_division is a function that creates the division and stores it to a global database; essentially, a wrapper.)
I tried the native cPickle module in Python 2.1.1 (to ensure that I had a clean version). Same problem -- it chokes on module objects.
The purpose of this code is to enable the user to select from several different sets of 'rules' ('APDA' is currently the only one written), which are implemented as Python modules. At run-time, when a 'division' is created, the ruleset is imported into the object instance as self
Do you have any suggestions as to how I might implement this?
Thanks,
Joe