Multiple not equal comparison
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I'd like to compare multiple objects and return `True` only if all objects are not equal among themselves. I tried using the code below, but it doesn't work. If obj1 and obj3 are equal and obj2 and obj3 are not equal, the result is `True`.

    obj1 != obj2 != obj3

I have more than 3 objects to compare. Using the code below is out of question:

    all([obj1 != obj2, obj1 != obj3, obj2 != obj3])