Saving dictionary whose keys are tuples with json, python

Question

I am writing a little program in python and I am using a dictionary whose (like the title says) keys and values are tuples. I am trying to use json as follows

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Answer 1

For Python 3* users: in addition to @Martijn Pieters answer,

dictonary.iteritems() is not valid, replace it with dictionary.items() :

json.dumps({str(k): v for k, v in data.items()})