Hi Arthur, Maybe this link helps you: http://www.doughellmann.com/PyMOTW/json/
<http://www.doughellmann.com/PyMOTW/json/>I used it to learn JSON. =o) Regards, Felipe. On Wed, Mar 2, 2011 at 11:24 AM, Peter Otten <__pete...@web.de> wrote: > Arthur Mc Coy wrote: > > > Hi all, > > > > > > > > I'm trying an example (in attached file, I mean the bottom of this > > message). > > > > First, I create a list of 3 objects. Then I do: > > > > > > PutJSONObjects(objects) > > objects = GetJSONObjects() > > PutJSONObjects(objects, "objects2.json") > > > > > > 1) PutJSONObjects(objects) method creates objects.json file (by > > default). It works fine. > > 2) Then objects = GetJSONObjects() method get the file contents and > > return. > > > > 3) Finally the script fails on the third method > > PutJSONObjects(objects, "objects2.json") > > saying: AttributeError: 'dict' object has no attribute '__dict__' > > > > > > That is true, because objects returned by GetJSONObjects() is not a > > list of objects, but simple string.... > > > > So here is the question, please, how should I DECODE .json file into > > list of python objects so that I will be able to put the copy of these > > objects into a new file called objects2.json ? > > > > simplejson docs are hard to follow - without examples. > > I suggest that you use json instead which is part of the standard library > since Python 2.6. The documentation is here: > > http://docs.python.org/library/json.html > > If you know that there are only MyObject instances you need a function to > construct such a MyObject instance from a dictionary. You can then recreate > the objects with > > objects = [object_from_dict(d) for d in json.load(f)] > > or, if all dictionaries correspond to MyObject instances > > objects = json.load(f, object_hook=object_from_dict) > > A general implementation for old-style objects (objects that don't derive > from object) is a bit messy: > > # idea copied from pickle.py > class Empty: > pass > > def object_from_dict(d): > obj = Empty() > obj.__class__ = MyObject > obj.__dict__.update((str(k), v) for k, v in d.iteritems()) # * > return obj > > If you are willing to make MyClass a newstyle class with > > class MyObject(object): > # ... > > the function can be simplified to > > def object_from_dict(d): > obj = object.__new__(MyObject) > obj.__dict__.update((str(k), v) for k, v in d.iteritems()) # * > return obj > > (*) I don't know if unicode attribute names can do any harm, > obj.__dict__.update(d) might work as well. > > -- > http://mail.python.org/mailman/listinfo/python-list >
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