Steven D'Aprano wrote:
list builder syntax is syntax which returns a list;
dict builder syntax is syntax which returns a dict;
set builder syntax is syntax which returns a set;
generator builder syntax is syntax which returns a generator.
You only get a list/dict/set from the first three after you've run the iterators within it, but with a generator expression, you already have a generator before you've run it. That makes it feel different to me.