将python 3.x字典保存到JSON

Question

The solution suggested in this answer allows saving a dict into json . For instance:

import json
with open('data.json', 'wb') as fp:
    json.dump(data, fp)

However, this doesn't work with 3.x . I get the following error:

TypeError: 'str' does not support the buffer interface

According to this answer , the solution is some sort of cast; but I don't manage to do it for a dictionary. What's the right way to save a dict to json using python 3.x?

Answer 1

remove the b :

with open('data.json', 'w') as fp:
    json.dump(data, fp)

json.dump

The json module always produces str objects, not bytes objects. Therefore, fp.write() must support str input.