Serializing list to JSON [duplicate]

This question already has answers here: How do I write JSON data to a file? (16 answers) Closed 3 months ago.

I am sending information between clien开发者_开发问答t and Django server, and I would like to use JSON to this. I am sending simple information - list of strings. I tried using django.core.serializers, but when I did, I got

AttributeError: 'str' object has no attribute '_meta'

It seems this can be used only for Django objects. How can I serialize simple, Python objects?

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You can use pure Python to do it:

import json
list = [1, 2, (3, 4)] # Note that the 3rd element is a tuple (3, 4)
json.dumps(list) # '[1, 2, [3, 4]]'

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If using Python 2.5, you may need to import simplejson:

try:
    import json
except ImportError:
    import simplejson as json

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Yes, but then what do you do about the django objects? simple json tends to choke on them.

If the objects are individual model objects (not querysets, e.g.), I have occasionally stored the model object type and the pk, like so:

seralized_dict = simplejson.dumps(my_dict, 
                     default=lambda a: "[%s,%s]" % (str(type(a)), a.pk)
                     )

to de-serialize, you can reconstruct the object referenced with model.objects.get(). This doesn't help if you are interested in the object details at the type the dict is stored, but it's effective if all you need to know is which object was involved.