转储和重新加载的JSON无法匹配原始结构

MCVE (with py.test)

MCVE（带py.test）

import json 
def test_minimum():
            internal={}
            internal[0]=""
            external={}
            with open("source.json", 'w') as outfile:
                    json.dump(internal, outfile)
            with open('source.json', 'r') as f:
                    external = json.load(f)
            assert external == internal
import