如何使用python替换json文件中的键的键值对

    {
    "xyz" : {
        "SERVER": "xxx@localhost",
        "WEBHCAT_SERVER": "https://qws.qs.i5.internal.cloudapp.net:50111/templeton/v1/",

    },
    "SNSPARK": {
        "PROJECT_BASE": "/home/databrik/newdp/projects",
        "SCRIPT_BASE": "/home/databrik/newdp/scripts",
        "DATA_FILE_BASE": "/home/databrik"
    },
    "LOCAL": {
        "PROJECT_BASE": "/home/pica/Installation/databricks/platform/projects",
        "SCRIPT_BASE": "/home/pica/Installation/databricks/platform/scripts",
        "DATA_FILE_BASE": "/home/pica",
        "CB_URL_BASE": "https://11.222.222.111:3017/api/v1"
    },
    "DEFAULT_BACKEND": "LOCAL",
    "public": {
        "USE_LDAP": false
    }
}
    {
    "xyz" : {
        "SERVER": "xxx@loca