如何使用 Python 從 Gmail API json 獲取特定密鑰？

Question

在 Python Gmail API 文檔中，get 函數提供了一個 json 輸出，我可以訪問“片段”數據。 我想訪問“標題”鍵的“值”信息。 我覺得這應該只是獲取多級 JSON 數據，但它正在逃避我。 有人可以幫我嗎？

http://googleapis.github.io/google-api-python-client/docs/dyn/gmail_v1.users.messages.html#get

{ # An email message.
      **"headers": [ # List of headers on this message part. For the top-level message part, representing the entire message payload, it will contain the standard RFC 2822 email headers such as To, From, and Subject.**
        {
          "name": "A String", # The name of the header before the : separator. For example, To.
          **"value": "A String", # The value of the header after the : separator. For example, someuser@example.com.**
        },
      ],
    "snippet": "A String", # A short part of the message text.
    "raw": "A String", # The entire email message in an RFC 2822 formatted and base64url encoded string. Returned in messages.get and drafts.get responses when the format=RAW parameter is supplied.
    "sizeEstimate": 42, # Estimated size in bytes of the message.
    "threadId": "A String", # The ID of the thread the message belongs to. To add a message or draft to a thread, the following criteria must be met:
        # - The requested threadId must be specified on the Message or Draft.Message you supply with your request.
        # - The References and In-Reply-To headers must be set in compliance with the RFC 2822 standard.
        # - The Subject headers must match.
    "labelIds": [ # List of IDs of labels applied to this message.
      "A String",
    ],
    "id": "A String", # The immutable ID of the message.
  }

        for message in messages:
            msg = service.users().messages().get(userId='me', id=message['id']).execute()
            print(msg['snippet']) # This works
            print(msg['value']) # This doesn't and I tried ['headers']['value'] also.
            print("\n")
            time.sleep(1)

Traceback (most recent call last):
  File "C:/Users/Notebook/PycharmProjects/Jarvis/Gmail.py", line 65, in <module>
    main()
  File "C:/Users/Notebook/PycharmProjects/Jarvis/Gmail.py", line 58, in main
    print("New Message: " + msg['value'])
KeyError: 'value'

Answer 1

標題中存在鍵"value" 。 您可以使用msg["headers"][0]["value"]訪問它

Answer 2

所以，我在 JSON 文件上做了一個漂亮的打印，我認為 Python Gmail API 是錯誤的。 我實際尋找的標題和相應數據位於“有效載荷”部分。 這是獲取數據的有效方法還是我做錯了？

         for message in messages:
            msg = service.users().messages().get(userId='me', id=message['id']).execute()
            message_from = msg['payload']['headers'][4]
            print("You have a new message from: " + message_from['value'])
            print(msg['snippet'])
            print("\n")
            time.sleep(1)