Question

尝试从名为weekdays:[0]的变量中向dow添加值。

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":""}

我在添加到字典和列表之间感到困惑。

尝试以下操作，但它会产生以下错误;

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

以下是错误。

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']的值是列表而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是其中的一个键。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

因为您尝试使用字符串访问列表的索引（0,1,2 ...）。

Python：将值添加到字典中的列表中

2 个答案: