Question

I’m trying to pickle a big class and getting

TypeError: can’t pickle module objects

despite looking around the web, I can’t exactly figure out what this means. and I’m not sure which module object is causing the trouble. is there a way to find the culprit? the stack trace doesn’t seem to indicate anything.

Answer 1

I can reproduce the error message this way:

import cPickle

class Foo(object):
    def __init__(self):
        self.mod=cPickle

foo=Foo()
with file('/tmp/test.out', 'w') as f:
    cPickle.dump(foo, f) 

# TypeError: can't pickle module objects

Do you have a class attribute that references a module?