class Foo
must be importable via the same path in the unpickling environment so that the pickled object can be reinstantiated.
I think your issue is that you define Foo
in the module that you are executing as main (__name__ == "__main__"
). Pickle will serialize the path (not the class object/definition!!!) to Foo
as being in the main module. Foo
is not an attribute of the main unpickle script.
In this example, you could redefine class Foo
in the unpickling script and it should unpickle just fine. But the intention is really to have a common library that is shared between the two scripts that will be available by the same path. Example: define Foo
in foo.py
Simple Example:
$PROJECT_DIR/foo.py
class Foo(object):
pass
$PROJECT_DIR/picklefoo.py
import cPickle
from foo import Foo
def pickleObject():
obj = Foo()
savefile = open('pickle.txt', 'w')
cPickle.dump(obj, savefile, cPickle.HIGHEST_PROTOCOL)
pickleObject()
$PROJECT_DIR/unpicklefoo.py
import cPickle
savefile = open('pickle.txt', 'r')
obj = cPickle.load(savefile)
...
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