I think it's more readable. It matches with the type name, it is consistent when you define different structures (list, set, dict vs [], set, {}), you can pass

I think it's more readable. It matches with the type name, it is consistent when you define different structures (list, set, dict vs [], set, {}), you can pass it as a function, etc. [] and {} is unnecessary syntax sugar, not to mention how the same parentheses are overloaded when sets are defined.