JSON serialize a dictionary with tuples as key

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You can’t serialize that as json, json has a much less flexible idea about what counts as a dict key than python.

You could transform the mapping into a sequence of key, value pairs, something like this:

import json
def remap_keys(mapping):
    return [{'key':k, 'value': v} for k, v in mapping.iteritems()]
... 
json.dumps(remap_keys({(1, 2): 'foo'}))
>>> '[{"value": "foo", "key": [1, 2]}]'

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