python3.6 json序列化后会将字典中为数的key转为字符串

1.测试

import json
from pprint import pprint
d = {i: i for i in range(4)}
d['1'] = 'good'
d['1.1'] = 'good'
d[1.1] = 'bad'
a = json.dumps(d)
b = json.loads(a)
print('orgin dict:')
pprint(d)
print('after handle with json:')
pprint(b)

输出如下：

orgin dict:
{0: 0, 1: 1, 1.1: 'bad', 2: 2, 3: 3, '1': 'good', '1.1': 'good'}
after handle with json:
{'0': 0, '1': 'good', '1.1': 'bad', '2': 2, '3': 3}