为什么我在这里得到 KeyError？

Question

我正在尝试获取日历中所有事件的标题，所以这是我从 Google website

中获取的代码

我的代码：

from Google import Create_Service
import datetime

CLIENT_SECRET_FILE = "secret.json"
API_NAME = 'calendar'
API_VERSION='v3'
SCOPES = ['https://www.googleapis.com/auth/calendar']

service = Create_Service(CLIENT_SECRET_FILE, API_NAME, API_VERSION, SCOPES)

sample = service.events()

page_token = None
while True:
  events = sample.list(calendarId='myemail@gmail.com', pageToken=page_token).execute()
  for event in events['items']:
    print(event['summary'])
  page_token = events.get('nextPageToken')
  if not page_token:
    break

我得到的输出：

Holiday

Holiday

Holiday

Holiday

Holiday

Holiday

Holiday

Holiday

Holiday

KeyError                                  Traceback (most recent call last)
Input In [3], in <module>
      3 events = sample.list(calendarId='myemail@gmail.com', pageToken=page_token).execute()
      4 for event in events['items']:
----> 5   print(event['summary'])
      6 page_token = events.get('nextPageToken')
      7 if not page_token:

KeyError: 'summary'

它在前几个事件中运行良好。怎么回事？

Answer 1

您的错误告诉您检索到的事件没有 summary 键。我不确定 event 对象到底是什么样子，但是您可以通过首先检查密钥是否存在来避免这样的错误：

page_token = None
while True:
  events = sample.list(calendarId='myemail@gmail.com', pageToken=page_token).execute()
  for event in events['items']:
    # .get() returns None instead of throwing an error, 
    # or, as I've done in this case, returns a default variable: "No summary found!"
    summary = event.get("summary", "No summary found!")
    print(summary)
  page_token = events.get('nextPageToken')
  if not page_token:
    break

为什么我在这里得到 KeyError？

Why am I getting KeyError here?

python

google-calendar-api

google-api

keyerror