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Pascal Betz ·Just stumbled over this question. What is the difference between. There is no difference. At least when looking at the observable outcome. And I prefer. Because of readability. But that is just a matter of taste. However there is a slight difference in how this outcome is calculated. Is a method defined on. Unless you mess with this implementation through monkeypatching a. Check is a simple method call. For your own objects (unless they inherit from. Which does not implement. The implementation stems from.
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