mwojc a écrit :
Hi!
My class with implemented __getattr__ and __setattr__ methods cannot be
pickled because of the Error:
======================================================================
ERROR: testPickle (__main__.TestDeffnet2WithBiases)
----------------------------------------------------------------------
Traceback (most recent call last):
File "deffnet.py", line 246, in testPickle
cPickle.dump(self.denet, file)
TypeError: 'NoneType' object is not callable
----------------------------------------------------------------------
Is there an obvious reason i don't know, which prevents pickling with those
methods (if i comment them out the pickling test passes)?
I'm using Python 2.4.4 on Gentoo Linux. The mentioned methods goes as
follows:
def __setattr__(self, name, value):
if name == 'weights':
j = 0
for net in self.nets:
w1 = self.wmarks[j]
w2 = self.wmarks[j+1]
net.weights = value[w1:w2]
j += 1
else:
self.__dict__[name] = value
def __getattr__(self, name):
if name == 'weights':
j = 0
for net in self.nets:
w1 = self.wmarks[j]
w2 = self.wmarks[j+1]
self._weights[w1:w2] = net.weights
j += 1
return self._weights
__getattr__ should raise an AttributeError when name != 'weight' instead
of (implicitely) returning None. pickle looks for a couple special
method in your object[1], and it looks like it doesn't bother to check
if what it found was really callable.
[1] cf http://docs.python.org/lib/pickle-inst.html
FWIW, you'd be better using a property instead of __getattr__ /
__setattr__ if possible. And while we're at it, you dont need to
manually take care of your index in the for loop - you can use
enumerate(iterable) instead:
for j, net in enumerate(self.nets):
w1 = self.wmarks[j]
w2 = self.wmarks[j+1]
self._weights[w1:w2] = net.weights
return self._weights
HTH
Greetings,
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