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我正在使用 IMAP 客户端。在我返回一个 imapclient 对象后，我将它与电子邮件的id和我希望电子邮件标记的标签字符串一起传递给下面的函数。这通常有效，但在少数情况下我会收到此错误。

添加标签时调用的函数

def label_gmail_message(client, msgid, label):
    """Function to label gmail messages after parsing

    Args:
        client (obj): imap client object to mail server
        msgid (str): id of message to label
        label (str): label string to be used
    """
    try:
        client.add_gmail_labels(msgid, label)
    except KeyError:
        log.exception(f"KeyError when labelling message : {msgid} with label {label}")

抛出错误

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/analisa-0.1.0-py3.7.egg/email_parser/imap_client.py", line 359, in label_gmail_message
    client.add_gmail_labels(msgid, label)
  File "/usr/local/lib/python3.7/site-packages/imapclient/imapclient.py", line 1034, in add_gmail_labels
    silent=silent)
  File "/usr/local/lib/python3.7/site-packages/imapclient/imapclient.py", line 1370, in _gm_label_store
    b'X-GM-LABELS', silent=silent)
  File "/usr/local/lib/python3.7/site-packages/imapclient/imapclient.py", line 1392, in _store
    fetch_key)
  File "/usr/local/lib/python3.7/site-packages/imapclient/imapclient.py", line 1396, in _filter_fetch_dict
    for msgid, data in iteritems(fetch_dict))
  File "/usr/local/lib/python3.7/site-packages/imapclient/imapclient.py", line 1396, in <genexpr>
    for msgid, data in iteritems(fetch_dict))
KeyError: b'X-GM-LABELS'
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