lars van gemerden wrote:
>> import pickle
>> import sys
>>
>> class MetaClass(type):
>> pass
>>
>> class M(object):
>> def __init__(self, module):
>> self.__module = module
>> def __getattr__(self, name):
>> print "creating class", name
>> class_ = MetaClass(name, (), {"__module__": self.__module})
>> setattr(self, name, class_)
>> return class_
>>
>> sys.modules["m"] = M("m")
>> import m
>> c = m.x
>> s = pickle.dumps(c)
>> print repr(s)
>> d = pickle.loads(s)
>>
>> assert c is d
>>
>> sys.modules["m"] = M("m")
>> e = pickle.loads(s)
>>
>> assert c is not e
>>
>> The official way is probably what Robert mentioned, via the copy_reg
>> module, but I didn't get it to work.
>
> I will look further into this. does "sys.modules["m"] = M("m")" create
> a new module?
Assigning to sys.modules[modulename] can put arbitrary objects into the
module cache, in this case an M instance. To drive the point home:
>>> import sys
>>> sys.modules["x"] = 42
>>> import x
>>> x
42
>>> sys.modules["x"] = "spam"
>>> import x
>>> x
'spam'
> Cheers, Lars
>
> PS: I get an error when posting this to the usenet group
Sorry, that seems to happen when I post via gmane and don't manually clear
the follow-up that my newsreader helpfully (knode) inserts. I've not yet
found a permanent fix, but if that was the problem you should be able to
answer this post.
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