Conditionally Add An Attribute To An Dictionary in Python

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Track title: Mysterious Puzzle

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Chapters
00:00 Question
00:35 Accepted answer (Score 4)
01:02 Answer 2 (Score 3)
01:21 Answer 3 (Score 2)
01:41 Answer 4 (Score 2)
01:58 Thank you

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Full question
https://stackoverflow.com/questions/5679...

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Content licensed under CC BY-SA
https://meta.stackexchange.com/help/lice...

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Tags
#python

#avk47

ACCEPTED ANSWER

Score 7

You can't do it with quite that syntax. For one thing, you need Python, not Java/C.

(1) add the attribute, but set to None:

obj = {'name': "Home",
       'url': "/",
       'data': num if num > 0 else None
      }

(2) make it an add-on:

obj = {'name': "Home",
       'url': "/"}
if num > 0:
    obj['data'] = num

ANSWER 2

Score 4

Just add/check it in separate statement:

def addSum(num):
    obj = {
        'name': "Home",
        'url': "/"
    }
    if num > 0: obj['data'] = num
    return obj

print(addSum(3))   # {'name': 'Home', 'url': '/', 'data': 3}
print(addSum(0))   # {'name': 'Home', 'url': '/'}

ANSWER 3

Score 2

Create the dictionary without the optional element, then add it in an if statement

def addSum(num):
    obj = {
        'name': "Home",
        'url': "/"
    }
    if num > 0:
        obj['data'] = num;

ANSWER 4

Score 2

Yes, just create the dictionary without the attribute, then create an if statement to add it if the condition is true:

def addSum(num):
    obj = {
          'name': "Home",
          'url': "/",      
    }
    if num > 0:
        obj['data'] = num

    return obj