python - 在 Python 中检查 JSON 响应中的空对象

Question

我有以下代码，它可以工作。我正在检查 JSON 对象是否具有完整字段且不包含底层字段(Jira API，如果您感兴趣)。有没有更简洁的 for 循环编写方法？

myResponse = requests.get(url,auth=(urlUser,urlPass))

jd = myResponse.json()
myVals = jd['issues']

print(myVals[0].keys())
for issue in myVals:
    if issue['fields']['assignee'] is not None:
        assignee = issue['fields']['assignee']['displayName']
    else:
        assignee = "Unassigned"

Answer 1

您可以使用dict.get使用后备字典:

>>> issues = {'fields': {'assignee': None}}
>>> issues['fields']['assignee'] or {}  # fallback to an empty dictionary
{}
>>> (issues['fields']['assignee'] or {}).get('displayName', 'Unassigned')
'Unassigned'

<小时/>

for issue in myVals:
    assignee = (issue['fields']['assignee'] or {}).get('displayName', 'Unassigned')

或定义后备字典，如下所示:

UNASSIGNED = {'displayName': 'Unassigned'}
for issue in myVals:
    assignee = (issue['fields']['assignee'] or UNASSIGNED)['displayName']