Python: 将值添加到字典中的列表中

Question

正在尝试从名为 dow 的变量中将值添加到 weekdays:[0]。

create_data = {"startDateTime":"2015-02-23T09:05:00-0600","endDateTime":"2015-02-23T10:05:00-0600","accessories":[],"customAttributes":[{"attributeId":"3","attributeValue":""},{"attributeId":"5","attributeValue":"Yes"}],"description":"Placeholder     Description","invitees":[],"participants":[],"recurrenceRule":[{"type":"weekly","interval":2,"weekdays":[0],"repeatTerminationDate":"2015-05-24T09:50:00-0600"}],"resourceId":"15","resources":["15"],"title":"","userId":"26","startReminder":"","endReminder":""}

我对添加到字典和列表之间感到困惑。

尝试了以下操作，但出现以下错误；

create_data['recurrenceRule']['weekdays'] = dow

下面是错误。

Traceback (most recent call last):
  File "api.py", line 51, in <module>
    create_data['recurrenceRule']['weekdays'] = dow
TypeError: list indices must be integers, not str

如何访问该值？

Answer 1

因为 create_data['recurrenceRule'] 的值是列表，列表包含字典作为项目。所以我们必须从列表中获取项目，即字典并在其中添加 weekdays 键。

create_data['recurrenceRule'][0]['weekdays'] = dow

Answer 2

create_data 是一个字典，recurrenceRule 是它的键之一。然后，它的值是一个列表：

>>> create_data['recurrenceRule']
[{'repeatTerminationDate': '2015-05-24T09:50:00-0600', 'interval': 2, 'type': 'weekly', 'weekdays': 2}]

因此，要更改 weekdays，您首先必须访问列表中的第一个元素：

create_data['recurrenceRule'][0]['weekdays']=dow
                             ^^^

这就是您收到此错误的原因：

create_data['recurrenceRule']['weekdays']
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: list indices must be integers, not str

因为您正试图访问带有字符串的列表的索引 (0, 1, 2...)。

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