On Wed, Sep 30, 2015, at 18:42, Nikolaus Rath wrote:
On Sep 30 2015, Andrew Barnert via Python-ideas <python-ideas-+ZN9ApsXKcEdnm+yROfE0A@public.gmane.org> wrote:
Also, explicit "it" would be usable in other situations:
z = dangerous_thing(arg) if it.value() > 3 else DummyValue(3)
Really? I'm not sure if "it" is "dangerous_thing" or "dangerous_thing(arg)".
I thought it was arg, though it's a bit silly for it to be. Why not go full Scheme and add a way to do lexical expressions that capture values for multiple use: z = (let it=arg: dangerous_thing(it) if it.value() > 3 else DummyValue(3)) Would be equivalent to z = (lambda it: dangerous_thing(it) if it.value() > 3 else DummyValue(3))(arg) Only without necessarily actually instantiating a lambda (i.e. it could push the result of arg [which may be any expression] onto the stack or in an anonymous or obscurely-named local variable slot to refer whenever it is referenced in the inner expression.