python和json数据相互转换,json读取和写入,repr…

import json  # 导入json包

data = [
    {
        "id": 1,
        "username": "zhangshan",
        "password": "123qwe",
        "lock": True
    },
    {
        "id": 2,
        "username": "lisi",
        "password": "123qwe",
        "lock": True
    },
    {
        "id": 3,
        "username": "wangwu",
        "password": "123qwe",
        "lock": False
    }
]

jsonStr = json.dumps(data)
# json数据
print(jsonStr)  # str 类型
# python数据
print('原始数据字符串:', repr(jsonStr))

pyStr = json.loads(jsonStr)
print(pyStr)

repr(object)  # 把一个对象转换为字符串,类似java的toString()
eval(str)  # 把repr() 转换的字符串 变为对象　　

# 写入 JSON 数据
with open('data1.json', 'w') as f:
    json.dump(data, f)

# 读取数据
with open('data1.json', 'r') as f:
    data = json.load(f)