How to take the dict into .txt file, when my keys are tuple?

Question

How to take the dict into .txt file, when my keys are tuple?

When my keys are int, it can run successfully.

But when the keys are tuple, it fails.

dict = {(1, 1): 11, (2, 2): 22, (3, 3): 33, (4, 4): 44, (5, 5): 55, (6, 6): 66, (7, 7): 77, (8, 8): 88, (9, 9): 99}

import json
with open('dict.txt', 'w') as file:
    file.write(json.dumps(dict))

TypeError: keys must be str, int, float, bool or None, not tuple

You can't. As the error says json-keys are restriced to `str`, `int`, `float`, `bool` or `None`. Do you have to use json? — timgeb, Nov 05 '21 at 08:22
The error is clear the keys of a JSON cannot be tuples, therefore you cannot use json.dumps to save to a file — Dani Mesejo, Nov 05 '21 at 08:22
Is there any other modules to write the dict into the text file? — Drizzle, Nov 05 '21 at 08:34
Remove `import json` line and replace `json.dumps` with `str` — Rish, Nov 05 '21 at 08:53

score 0 · Answer 1 · answered Nov 05 '21 at 08:23

0

You could convert the keys to strings.

new_dict = {}
for k,v in dict.items():
    new_dict[str(k)] = v

Then you could write the new_dict to the text file.

answered Nov 05 '21 at 08:23

areobe

167
10

score 0 · Accepted Answer · edited May 05 '22 at 07:07

You can convert your tuple to string before loading into json:

dict = {(1, 1): 11, (2, 2): 22, (3, 3): 33, (4, 4): 44, (5, 5): 55, (6, 6): 66, (7, 7): 77, (8, 8): 88, (9, 9): 99}

import json

def map_dict(d):
    return {str(k): v for k, v in d.items()}


with open('dict.txt', 'w') as file:
    file.write(json.dumps(map_dict(dict)))

Or you can directly convert dict to str:

dict = {(1, 1): 11, (2, 2): 22, (3, 3): 33, (4, 4): 44, (5, 5): 55, (6, 6): 66, (7, 7): 77, (8, 8): 88, (9, 9): 99}

with open('dict.txt', 'w') as file:
    file.write(str(dict))

How to take the dict into .txt file, when my keys are tuple?

2 Answers2