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Groups > comp.lang.python > #51322

RE: dump a multi dimensional dictionary

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cerr wrote:
> Hi,
> 
> Can I somehow use pickle.dump() to store a dictionary of lists to a file?
> I tried this:
> 
>     >>> import pickle
>     >>> mylist = []
>     >>> mydict = {}
>     >>> mylist = '1','2'
>     >>> mydict['3'] = mylist
>     >>> fhg = open ("test", 'w')
>     >>> pickle.dump(fhg,mydict)
>     Traceback (most recent call last):
>       File "<stdin>", line 1, in <module>
>       File "/usr/lib/python2.7/pickle.py", line 1370, in dump
>         Pickler(file, protocol).dump(obj)
>       File "/usr/lib/python2.7/pickle.py", line 203, in __init__
>         self.write = file.write
>     AttributeError: 'dict' object has no attribute 'write'
>     >>> print mydict
>     {'3': ('1', '2')}
> 
> or should I just write my own dump function that can hanle thiS?
> 
> Please advise!
> 
> Thanks,
> Ron

I think you have the parameters for dump backwards.

According to API http://docs.python.org/2/library/pickle.html#pickle.dump
the format is: pickle.dump(obj, file, protocol=None)

Which means you need to use: pickle.dump(mydict, fhg)


Ramit



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dump a multi dimensional dictionary cerr <ron.eggler@gmail.com> - 2013-07-26 13:21 -0700
  Re: dump a multi dimensional dictionary John Gordon <gordon@panix.com> - 2013-07-26 21:00 +0000
  RE: dump a multi dimensional dictionary "Prasad, Ramit" <ramit.prasad@jpmorgan.com> - 2013-07-26 20:40 +0000
  Re: dump a multi dimensional dictionary Chris Angelico <rosuav@gmail.com> - 2013-07-27 00:33 +0100
  Re: dump a multi dimensional dictionary Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-07-27 02:54 +0000

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