Why can't instance methods be pickled?

[Nicholas K. Sauter]

Hello all,
    This very simple example fails because instance methods cannot be
pickled:

import pickle,sys

class foo:
  def __init__(self):
    self.advertise = self.message
  def message(self):
    print "I am spam"

f = foo()
f.advertise()
pickle.dump(f, sys.stdout)
#raises a pickle.PicklingError

    Is there a fundamental reason why instance method pickling is not
implemented? Has anyone written code to solve this problem?

Nick Sauter
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