Re: deepcopy alternative?
Szabolcs Nagy wrote: I believe the only thing stopping me from doing a deepcopy is the function references, but I'm not sure. If so is there any way to transform a string into a function reference(w/o eval or exec)? what's your python version? for me deepcopy(lambda:1) does not work in py2.4 but it works in py2.5 (in py2.4 i tried to override __deepcopy__ but it had no effect) Thanks that fixed the problem real quick :) Jack Trades -- http://mail.python.org/mailman/listinfo/python-list
deepcopy alternative?
I have a very complex data structure which is basically a class object containing (sometimes many) other class objects, function references, ints, floats, etc. The man for the copy module states pretty clearly that it will not copy methods or functions. I've looked around for a while (prob just using the wrong keywords) and haven't found a good solution. As a workaround I've been using cPickle, loads(dumps(obj)) which is incredibly slow (~8 sec for a 1000 elem list). I believe the only thing stopping me from doing a deepcopy is the function references, but I'm not sure. If so is there any way to transform a string into a function reference(w/o eval or exec)? Example from copy import deepcopy a = ClassObj([ClassObj([3.2, 'str', funcRef]), 4, ClassObj[funcRef]) b = deepcopy(a) TypeError: function() takes at least 2 arguments (0 given) All I want is a deepcopy of the list. Any suggestions would be appreciated. Jack Trades PS: If the answer to this is in __getstate__() or __setstate__() is there some reference to how these should be implemented besides the library reference? -- http://mail.python.org/mailman/listinfo/python-list
Re: deepcopy alternative?
I believe the only thing stopping me from doing a deepcopy is the function references, but I'm not sure. If so is there any way to transform a string into a function reference(w/o eval or exec)? what's your python version? for me deepcopy(lambda:1) does not work in py2.4 but it works in py2.5 (in py2.4 i tried to override __deepcopy__ but it had no effect) -- http://mail.python.org/mailman/listinfo/python-list
Re: deepcopy alternative?
En Mon, 29 Jan 2007 20:17:11 -0300, none @bag.python.org escribió:
I have a very complex data structure which is basically a class object
containing (sometimes many) other class objects,
What are class objects? instances of a given class, or a class itself?
function references,
ints, floats, etc. The man for the copy module states pretty clearly
that it will not copy methods or functions. I've looked around for a
while (prob just using the wrong keywords) and haven't found a good
solution. As a workaround I've been using cPickle, loads(dumps(obj))
which is incredibly slow (~8 sec for a 1000 elem list).
I believe the only thing stopping me from doing a deepcopy is the
function references, but I'm not sure. If so is there any way to
transform a string into a function reference(w/o eval or exec)?
What do you mean by function reference? A module-level function works
fine both with pickle and copy. Methods do not; but it's not common to
take methods out of a class and put them inside a tuple, by example...
Example
from copy import deepcopy
a = ClassObj([ClassObj([3.2, 'str', funcRef]), 4, ClassObj[funcRef])
b = deepcopy(a)
TypeError: function() takes at least 2 arguments (0 given)
Please provide a *running* example. I've added some definitions, corrected
some syntax errors, and this full example works for me:
--- cut ---
from copy import deepcopy
class ClassObj(object):
def __init__(self, args):
self.data = args
def funcRef(x):
print x
a = ClassObj([ClassObj([3.2, 'str', funcRef]), 4, ClassObj([funcRef])])
b = deepcopy(a)
print a is b
a.data.append('hello')
print len(a.data), len(b.data)
--- cut ---
PS: If the answer to this is in __getstate__() or __setstate__() is
there some reference to how these should be implemented besides the
library reference?
Until you provide more info on your problem it's hard to tell.
--
Gabriel Genellina
--
http://mail.python.org/mailman/listinfo/python-list
