Best way to encode tuples with json

Question

In python I have a dictionary that maps tuples to a list of tuples. e.g.

{(1,2): [(2,3),(1,7)]}

I want to be able to encode this data use it with j

Answer 1

If your key tuples are truly integer pairs, then the easiest and probably most straightforward approach would be as you suggest.... encode them to a string. You can do this in a one-liner:

>>> simplejson.dumps(dict([("%d,%d" % k, v) for k, v in d.items()]))
'{"1,2": [[2, 3], [1, 7]]}'

This would get you a javascript data structure whose keys you could then split to get the points back again:

'1,2'.split(',')