Why does `{*()}` produces an empty set `set()`? I am not able to understand it logically

my_set = {*()} print(my_set)

I am not able to understand why this syntax produces an empty set by tuple unpacking? In other words, I am not sure how this works. I would appreciate if someone explains this.

It seems that the starred syntax is only used for creating a set so that’s what you get even though it’s an empty one-

I think the OP wants to understand it logically. He wants to understand why unpacking the tuple inside the curly braces {*()} outputs set().

I’m not sure there’s much more to it, the parser interprets this as creating a set instead of an empty dictionary, the fact that it’s an empty tuple being unpacked doesn’t seem to matter.

My first response was trying to approach this logically but I believe it’s the syntax used that results in a set here.

That seems like nicer behaviour too. If you were passing and unpacking an iterable in this way you must be trying to create a set, if your iterable was empty and suddenly you got a dictionary instead then it would be even more confusing.

1 Like