[Linuxtrent] python: traits e pickle
- From: Emanuele Olivetti <olivetti@xxxxxx>
- To: linuxtrent <linuxtrent@xxxxxxxxxxxxx>
- Date: Thu, 6 Nov 2003 19:22:11 +0100
Visto che c'e' qualche esperto di Python Traits (e di Python) vi
chiedo questo: perche' la serializzazione di una classe che usa
i Traits mi da errore ("TypeError: can't pickle function objects")?
Esempio:
---------------------------------------------------
import traits
import pickle
class Persona(traits.HasTraits):
__traits__={
'nome' : 'unknown',
'cognome' : 'unknown',
}
if __name__=='__main__':
p=Persona(nome='Emanuele', congnome='Olivetti')
a=pickle.dumps(p)
print a
---------------------------------------------------
Mi dice che non posso fare il pickling dell'istanza 'p':
TypeError: can't pickle function objects
Perche'?
Riporto qui di seguito il log completo dell'errore:
-----
Traceback (most recent call last):
File "traits-test.py", line 13, in ?
a=pickle.dumps(p)
File "/opt/python2.3/lib/python2.3/pickle.py", line 1386, in dumps
Pickler(file, protocol, bin).dump(obj)
File "/opt/python2.3/lib/python2.3/pickle.py", line 231, in dump
self.save(obj)
File "/opt/python2.3/lib/python2.3/pickle.py", line 293, in save
f(self, obj) # Call unbound method with explicit self
File "/opt/python2.3/lib/python2.3/pickle.py", line 739, in save_inst
save(stuff)
File "/opt/python2.3/lib/python2.3/pickle.py", line 293, in save
f(self, obj) # Call unbound method with explicit self
File "/opt/python2.3/lib/python2.3/pickle.py", line 663, in save_dict
self._batch_setitems(obj.iteritems())
File "/opt/python2.3/lib/python2.3/pickle.py", line 677, in _batch_setitems
save(v)
File "/opt/python2.3/lib/python2.3/pickle.py", line 313, in save
rv = reduce(self.proto)
File "/opt/python2.3/lib/python2.3/copy_reg.py", line 69, in _reduce_ex
raise TypeError, "can't pickle %s objects" % base.__name__
TypeError: can't pickle function objects
-------
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