在Python中检查JSON响应中的空对象

我有下面的代码，它可以工作。我正在检查一个JSON对象是否有一个完整的字段，并且不包含底层字段（如果您感兴趣，请参阅JIRAAPI）。有没有更简洁的方法来编写for循环

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"

您可以与回退字典一起使用：

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

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或按如下方式定义回退字典：

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

---

下面的代码工作得很好。我想这两种方法是一种偏好<代码>对于MyVAL中的问题：assignee=（问题['fields']['assignee']或{}）。获取（'displayName'，'Unassigned'）

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