怎么用python提取{"SIPSUB":{"info":{"courseRole":28,"courseType":1,"detail":"","id":"R28","memberLen":4,"members":[{"infoAccount":"420","infoAlias":"420主讲","infoIp":"","stAudio":true,"stCamera":true,"stMic":false,"stRole":1,"stStatus":3,"stVideo":true},{"infoAccount":"421","infoAlias":"421听讲","infoIp":"","stAudio":false,"stCamera":true,"stMic":false,"stRole":2,"stStatus":3,"stVideo":true},{"infoAccount":"422","infoAlias":"422听讲","infoIp":"","stAudio":false,"stCamera":true,"stMic":false,"stRole":2,"stStatus":0,"stVideo":false},{"infoAccount":"423","infoAlias":"423听讲","infoIp":"","stAudio":false,"stCamera":true,"stMic":false,"stRole":2,"stStatus":0,"stVideo":false}],"speaker":"","timeEnd":"","timeStart":"","title":"420课堂互动4人"}} 中所有的infoAccount

要提取给定字典中所有的 "infoAccount" 值，你可以使用 Python 的字典操作。以下是一种可能的方法：

data = {
    "SIPSUB": {
        "info": {
            "courseRole": 28,
            "courseType": 1,
            "detail": "",
            "id": "R28",
            "memberLen": 4,
            "members": [
                {
                    "infoAccount": "420",
                    "infoAlias": "420主讲",
                    "infoIp": "",
                    "stAudio": True,
                    "stCamera": True,
                    "stMic": False,
                    "stRole": 1,
                    "stStatus": 3,
                    "stVideo": True
                },
                {
                    "infoAccount": "421",
                    "infoAlias": "421听讲",
                    "infoIp": "",
                    "stAudio": False,
                    "stCamera": True,
                    "stMic": False,
                    "stRole": 2,
                    "stStatus": 3,
                    "stVideo": True
                },
                {
                    "infoAccount": "422",
                    "infoAlias": "422听讲",
                    "infoIp": "",
                    "stAudio": False,
                    "stCamera": True,
                    "stMic": False,
                    "stRole": 2,
                    "stStatus": 0,
                    "stVideo": False
                },
                {
                    "infoAccount": "423",
                    "infoAlias": "423听讲",
                    "infoIp": "",
                    "stAudio": False,
                    "stCamera": True,
                    "stMic": False,
                    "stRole": 2,
                    "stStatus": 0,
                    "stVideo": False
                }
            ],
            "speaker": "",
            "timeEnd": "",
            "timeStart": "",
            "title": "420课堂互动4人"
        }
    }
}

info_accounts = [member["infoAccount"] for member in data["SIPSUB"]["info"]["members"]]
print(info_accounts)

这段代码首先定义了一个包含给定字典的变量 `data`。然后，使用列表推导式从 `data["SIPSUB"]["info"]["members"]` 中提取每个成员的 "infoAccount" 值，并将它们存储在名为 `info_accounts` 的列表中。最后，打印 `info_accounts` 列表以查看提取的值。

运行以上代码，输出将是：

['420', '421', '422', '423']

这些就是给定字典中所有的 "infoAccount" 值。