python - 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 heard that in Python that single and double quote can be interchangable. Can anyone explain this to me?

Answer 1

JSON syntax is not Python syntax. JSON requires double quotes for its strings.