Re: How to pickle bound methods

[srinivasan srinivas]

No. It does not work.

def make_staticmeth od(inst, methodname):
    return getattr(inst, methodname)
def pickle_function (method):
    return make_staticmeth od, (method.im_self , method.im_func. __name__)
copy_reg.pickle (new.function, pickle_function , make_staticmeth od)



----- Original Message ----
From: Peter Otten <__peter__@web. de>
To: python-list@python.org
Sent: Thursday, 3 July, 2008 12:13:45 PM
Subject: Re: How to pickle bound methods

srinivasan srinivas wrote:

Please don't top-post.

Could you please explain the code breifly?? I am not getting what it does.

>import copy_reg
>import new
>
>def make_instanceme thod(inst, methodname):
>    return getattr(inst, methodname)
>
>def pickle_instance method(method):
>    return make_instanceme thod, (method.im_self , method.im_func. __name__)
>
>copy_reg.pickl e(new.instancem ethod, pickle_instance method,
>make_instancem ethod)

If you have a type that cannot be pickled because it is implemented in C you
can make it "picklable" by registering it with the copy_reg.pickle ()
function. This function takes three arguments:

1 the type (here: new.instancemet hod)
2 a function that takes aninstance of the type. This returns a factory
function and a tuple of thearguments this factory function needs to
recreate the instance.
3 the factory function.

In short the following must work, and out_method should do the same thing as
in_method:

factory, args = pickle_instance method(in_metho d)
out_method = factory(*args)

Now to your other problem, pickling static methods. The type of a static
method is just new.function, the same as that of a global function. Global
functions are already picklable, so the copy_reg mechanism doesn't kick in.

Peter
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[Peter Otten]

Re: How to pickle bound methods

srinivasan srinivas wrote:

Please don't top-post.

No. It does not work.

That's what I said. Try

class A(object):
@staticmethod
def alpha():
print "Hello"

alpha = A.alpha

Peter