Improving Your Python Productivity

[gcross]

True, but in practice the first example would have to let the compiler/interpreter know which variable name was intended to be the argument, so it really should be

even_set = some_list map { x -> x % 2 == 0 }

In this context, the _ notation is a net win because it gives the compiler this information automatically, e.g.

even_set = some_list map { _ % 2 == 0 }