On Jan 23, 2:48 pm, perfr...@gmail.com wrote:
> hello,
>
> i am using nested defaultdict from collections and i would like to
> write it as a pickle object to a file. when i try:
>
> from collections import defaultdict
> x = defaultdict(lambda: defaultdict(list))
>
> and then try to write to a pickle file, it says:
>
> TypeError: can't pickle function objects
>
> is there a way around this? it's simply a dictionary that i want to
> write to file.. this works no problems with ordinary dicts.
>
> thank you.
One way via a subclass:
(from memory)
class MyCollection(defaultdict):
def __init__(self):
defaultdict.__init__(self, list)
def __reduce__(self):
return (MyCollection, (), None, None, self.iteritems())
and if you are so inclined (nothing to do with pickling):
__setattr__ = defaultdict.__setitem__
__getattr__ = defaultdict.__getitem__
G.
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