CODEWITHSUNDEEP
pythonjsondictionarytuplesdump
Tomas Lukac
Tomas Lukac

Reputation: 2265

Json dump of dict with tuples inside in Python

I have a dictionary in Python which maps tuple to a number as follows.

The goal is to have my data printed in pretty json format, but I am getting an error

import json

data = {
        (7, 0, 4, 1, 0, 0, 3): 2,
        (7, 0, 3, 1, 0, 0, 3): 1,
        (2, 0, 0, 1, 0, 0, 1): 3,
        (7, 0, 2, 1, 0, 0, 3): 4,
        (7, 0, 4, 1, 0, 0, 2): 1,
        (0, 0, 0, 0, 0, 0, 0): 2,
    }

print (json.dumps(data))

I am getting an error

return _iterencode(o, 0)
TypeError: keys must be a string

Apparently it has something to do with the tuple.

Casting data to string does not work, it only returns one-line result.

"{(7, 0, 4, 1, 0, 0, 3): 2, (7, 0, 3, 1, 0, 0, 3): 1, (2, 0, 0, 1, 0, 0, 1): 3, (7, 0, 2, 1, 0, 0, 3): 4, (7, 0, 4, 1, 0, 0, 2): 1, (0, 0, 0, 0, 0, 0, 0): 2}"

Upvotes: 0

Views: 1679

Answers (1)

Anton vBR
Anton vBR

Reputation: 18914

keys in json must be strings. Try this: 

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

You can also use indent to make it prettier:

print (json.dumps(({str(k):v for k,v in data.items()}),indent=2))

Upvotes: 2

Related Questions