[PEAK] Pickable Components and Python Remote Objects

[Sigve Tjora]

Hi again,
Thanks for prompt answer Phillip.

I am sorry for the fairly untested code-example I sent you. It turns out 
that it only happens when I run the example after a specific python file 
which has been run with the %run magic command of ipython. So it is 
probably some not really important corner case between ipython and peak.

For the record, I have attached the minimal procedure to reproduce the 
error at the end of this mail. However I do not intend nor need anyone 
to fix this, I only add it as a reference if anyone should turn into the 
same problem.

Regards Sigve


I am using IPython 0.6.15, Python 2.4.1, 
PEAK-0.5a4dev_r2085-py2.4-win32.egg on Windows XP.

Make a file peakpickle.py containing:
from peak.api import *
import pickle

class MyComponent(binding.Component):
  pass

Then enter the following commands in the IPython:

IPython 0.6.15 -- An enhanced Interactive Python.
?       -> Introduction to IPython's features.
%magic  -> Information about IPython's 'magic' % functions.
help    -> Python's own help system.
object? -> Details about 'object'. ?object also works, ?? prints more.

In [1]: %run peakpickle.py

In [2]: class A(binding.Component):pass
 ...:

In [3]: a = A()

In [4]: pickle.dumps(a)
---------------------------------------------------------------------------
pickle.PicklingError                             Traceback (most recent 
call la
t)

D:\PhD\fpga\pyfuse\<console>

c:\python24\lib\pickle.py in dumps(obj, protocol, bin)
 1384 def dumps(obj, protocol=None, bin=None):
 1385     file = StringIO()
-> 1386     Pickler(file, protocol, bin).dump(obj)
 1387     return file.getvalue()
 1388

c:\python24\lib\pickle.py in dump(self, obj)
  229         if self.proto >= 2:
  230             self.write(PROTO + chr(self.proto))
--> 231         self.save(obj)
  232         self.write(STOP)
  233

c:\python24\lib\pickle.py in save(self, obj)
  336
  337         # Save the reduce() output and finally memoize the object
--> 338         self.save_reduce(obj=obj, *rv)
  339
  340     def persistent_id(self, obj):

c:\python24\lib\pickle.py in save_reduce(self, func, args, state, 
listitems, di
titems, obj)
  413         else:
  414             save(func)
--> 415             save(args)
  416             write(REDUCE)
  417

c:\python24\lib\pickle.py in save(self, obj)
  291         f = self.dispatch.get(t)
  292         if f:
--> 293             f(self, obj) # Call unbound method with explicit self
  294             return
  295

c:\python24\lib\pickle.py in save_tuple(self, obj)
  574         write(MARK)
  575         for element in obj:
--> 576             save(element)
  577
  578         if id(obj) in memo:

c:\python24\lib\pickle.py in save(self, obj)
  300             issc = 0
  301         if issc:
--> 302             self.save_global(obj)
  303             return
  304

c:\python24\lib\pickle.py in save_global(self, obj, name, pack)
  758             klass = getattr(mod, name)
  759         except (ImportError, KeyError, AttributeError):
--> 760             raise PicklingError(
  761                 "Can't pickle %r: it's not found as %s.%s" %
  762                 (obj, module, name))

PicklingError: Can't pickle <class '__main__.A'>: it's not found as 
__main__.A

In [5]: