如何使用json.dumps（）将所有int转换为嵌套dict中的str？

Question

I have, an an input, integers. I build a dict out of them (as values). I then dump it to JSON, to be reused elsewhere.

I ultimately (at the "elsewhere") need to use these integers as strings. I can therefore do the conversion

• upstream (when building the dict)
• or on the receiving side (the "elsewhere").

There will be, no matter the solution, plenty of str() all over the code. I am looking for a cleaner way to convert all the int into str in that specific case.

One idea is to recursively parse the dict once it is built, just before the json.dumps() , and make the conversion there. I am wondering, though, if there is not a way to handle this while dumping the JSON? Possibly with json.JSONEncoder ? (which to be frank I do not understand much)

Answer 1

Assuming that on the receiving end you are running Python, you could convert the ints to strings upon loading the JSON by using the parse_int parameter:

import json

test = {'foo':1, 'bar':[2,3]}
json_str = json.dumps(test)
print(json.loads(json_str, parse_int=str))

yields

{u'foo': '1', u'bar': ['2', '3']}

---

Per the docs :

parse_int , if specified, will be called with the string of every JSON int to be decoded. By default this is equivalent to int(num_str). This can be used to use another datatype or parser for JSON integers (eg float).