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I agree with everything Steven says. But it's true that even as a 20-year Python user, this is an error I make moderately often when I want an empty set... Notwithstanding that I typed it thousands of times before sets even existed (and still type it when I want an empty dictionary).

That said, I've sort of got in the habit of using the type initializers:

x = set()

y = dict()

z = list()

I feel like those jump out a little better visually. But I'm inconsistent in my code.