Single vs double quotes in JSON

Question

My code:

import simplejson as json

s = "{'username':'dfdsfdsf'}" #1
#s = '{"username":"dfdsfdsf"}' #2
j = json.loads(s)

#1 definition is wrong

#2 definition is right

I was heard that in Python that single double quote can be interchangable, can anyone explain this for me?

Answer 1

import json
data = json.dumps(list)
print(data)

The above code snippet should work.

Answer 2

you can use ast.literal_eval()

>>> import ast
>>> s = "{'username':'dfdsfdsf'}"
>>> ast.literal_eval(s)
{'username': 'dfdsfdsf'}