Checking null object from JSON response in Python

Question

I have the following code, and it works. I am checking if a JSON object has a full field and does not contain the underlying fields (Jira API, if you're interested). Is there a more concise way of writing the for loop?

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"

falsetru · Accepted Answer · 2016-03-31 01:36:05Z

3

You can use dict.get with fallback dictionary:

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

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

OR define fallback dictionary like below:

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

edited Mar 31, 2016 at 1:36

answered Mar 31, 2016 at 1:30

falsetru

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1 Comment

Mark D Over a year ago

The following code worked perfectly. I'm assuming the two methods are a matter of preference? for issue in myVals: assignee = (issue['fields']['assignee'] or {}).get('displayName', 'Unassigned')

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