Akemi

Python json模块案例—提取与交换json数据

2024/11/09

json格式大体是一个字典的格式，而众所周知字典是什么类型的数据都可以嵌套进去的

方法介绍：

1.json.dump()
将python对象转换为json格式写入文件

json.dumps()
将python对象转换为json格式输出

2.json.load
文件中读取json数据，转换为python对象

json.loads
将json数据转换为python对象

读取与重新写入配置文件

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{
    "service_name": "MyApp",
    "version": "1.0.0",
    "logging": {
        "level": "INFO",
        "log_file": "app.log",
        "log_format": "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
    },
    "database": {
        "host": "localhost",
        "port": 5432,
        "user": "db_user",
        "password": "secure_password",
        "database_name": "my_database"
    },
    "server": {
        "host": "0.0.0.0",
        "port": 8080,
        "timeout": 30,
        "max_connections": 100
    }
}
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#coding=utf-8
import json

with open('config','r') as file:
    # 读取并写入config
    config=json.load(file)

# 修改config这个字典
config['version']='1.0.1'

with open('config','w') as file:
    # 将config重新写入文件,indent表示换行 缩进
    json.dump(config,file,indent=2)

收集硬件状态并写入json文件

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#coding=utf-8
import json
import psutil
import shutil
from datetime import datetime
from time import sleep

status_data=[]

# 定时收集服务器状态

for i in range(5):
    status={
        'timestamp': datetime.now().strftime('%Y-%m-%d_%H-%M-%S'),
        'cpu_usage': psutil.cpu_percent(),
        'memory_usage': psutil.virtual_memory().percent,
        'disk_total': f"{shutil.disk_usage('/').total/(2**30):.2f}GiB",
        'disk_usage': f"{shutil.disk_usage('/').used/(2**30):.2f}GiB",
        'disk_free': f"{shutil.disk_usage('/').free/(2**30):.2f}GiB"
    }
    # 将字典追加到列表中
    status_data.append(status)
    sleep(1)

with open('server_status.json','w',encoding='utf-8') as file:
    json.dump(status_data,file,indent=2)

修改权限文件

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{
    "user123": {
        "username": "user123",
        "access_level": "user",
        "last_login": "2028-09-28 18:18:45",
        "active": true
    },
    "user456": {
        "username": "user456",
        "access_level": "admin",
        "last_login": "2028-09-18 10:18:30",
        "active": true
    },
    "user789": {
        "username": "user789",
        "access_level": "guest",
        "last_login": "2028-09-08 09:18:05",
        "active": false
    }
}
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#coding=utf-8
import json
with open('permiss.json','r') as f:
    # 转成字典，赋给permission
    permission=json.load(f)
# 修改字典的内容
permission['user123']['access_level']='admin'
with open('permiss.json','w') as f:
    json.dump(permission,f,indent=4)

原文作者：王盛

原文链接：https://akemi.zj.cn/2024/11/09/Python-Module-json/

发表日期：November 9th 2024, 7:48:11 pm

更新日期：February 20th 2025, 6:37:27 pm

版权声明：本文采用知识共享署名-非商业性使用 4.0 国际许可协议进行许可

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