Python's [] at least 3x faster than list()?

Question

It appears that using [] around a generator expression (test1) behaves substantially better than putting it inside of list() (test2). The slowdown isn\'t there when I simpl

Answer 1

list(e for e in x) isn't a list comprehension, it's a genexpr object (e for e in x) being created and passed to the list factory function. Presumably the object creation and method calls create overhead.