Check if List contains object without fields

Question

I have an API response that can respond with an array like this:

[ { "id": 1, "title": "Warning" }, { "id": 2, "title": "Warning" } ]

sometimes it can respond just empty array

[]

in my case i created a class for this object. Something like this:

class Warning: def __init__(self, data: Dict): if bool(data): self.id: int = data["id"] self.title: str = data["title"] else: pass if __name__ == '__main__': data = { "id": 123455, "title": "Warning" } empty_data = {} object1: List[Warning] = [Warning(data)] object2: List[Warning] = [Warning(empty_data)] if object1: print("we have a warnings") if object2: print("we don't have warnings")

I can't understand, how can I check if i get List of Object with empty fields like object2?

Use if data: or if len(data) > 0: to test for a non-empty list. Typically the former. — jarmod
– jarmod, Commented Feb 7, 2022 at 17:20
I've tried this and in my case it always returns true. This is because i put object into a list and list is always has length. And i want to check that object is created properly with data — Ilya Zaytsev
– Ilya Zaytsev, Commented Feb 8, 2022 at 15:21

Interested Developer · Accepted Answer · 2022-02-08 11:49:20Z

I would suggest looking at the __bool__ class method which enables you to determine the boolean value of a python class.

However, you will also need to decide what the boolean value of the list should be e.g. should bool([Warning(empty_data), Warning(data)]) return False or True?

That worked for me. Thanks! In class i created __bool__ function which check if object has attribute of properly created fields

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