How do I extract username from the json.loads object答案

【问题标题】：How do I extract username from the json.loads objectHow do I extract username from the json.loads object
【发布时间】：2022-12-02 06:27:01
【问题描述】：

I have a following block of code:

import json
from types import SimpleNamespace

data=json.dumps(
{
  "update_id": 992108054,
  "message": {
    "delete_chat_photo": False,
    "new_chat_members": [],
    "date": 1669931418,
    "photo": [],
    "entities": [],
    "message_id": 110,
    "group_chat_created": False,
    "caption_entities": [],
    "new_chat_photo": [],
    "supergroup_chat_created": False,
    "chat": {
      "type": "private",
      "first_name": "test_name",
      "id": 134839552,
      "last_name": "test_l_name",
      "username": "test_username"
    },
    "channel_chat_created": False,
    "text": "test_text",
    "from": {
      "last_name": "test_l_name",
      "is_bot": False,
      "username": "test_username",
      "id": 134839552,
      "first_name": "test_name",
      "language_code": "en"
    }
  }
})
x = json.loads(data, object_hook=lambda d: SimpleNamespace(**d))
print(x.message.text,
      x.message.chat
        )

Which works fine. However, when I add

print(x.message.from)

I get an error:

 File "<ipython-input-179-dec1b9f9affa>", line 1
    print(x.message.from)
                    ^
SyntaxError: invalid syntax

Could you please help me? How can I access fields inside 'from' block?

【问题讨论】：

标签： python json telegram-bot

【解决方案1】：

You can access the fields inside the from block by using square bracket notation instead of dot notation. Here is how your code would look with the changes:


data=json.dumps(
{
  "update_id": 992108054,
  "message": {
    "delete_chat_photo": False,
    "new_chat_members": [],
    "date": 1669931418,
    "photo": [],
    "entities": [],
    "message_id": 110,
    "group_chat_created": False,
    "caption_entities": [],
    "new_chat_photo": [],
    "supergroup_chat_created": False,
    "chat": {
      "type": "private",
      "first_name": "test_name",
      "id": 134839552,
      "last_name": "test_l_name",
      "username": "test_username"
    },
    "channel_chat_created": False,
    "text": "test_text",
    "from": {
      "last_name": "test_l_name",
      "is_bot": False,
      "username": "test_username",
      "id": 134839552,
      "first_name": "test_name",
      "language_code": "en"
    }
  }
})
x = json.loads(data, object_hook=lambda d: SimpleNamespace(**d))
print(x.message.text,
      x.message.chat
        )
print(x.message["from"])

In Python, you use square bracket notation [] to access dictionary keys, and dot notation . to access object attributes. In this case, from is a reserved keyword in Python, so you cannot use dot notation to access it directly. Instead, you must use square bracket notation to access it.

(ChatGPT AI assisted with this answer)

【讨论】：