On Fri, May 29, 2020 at 3:19 AM Stephen J. Turnbull <turnbull.stephen.fw@u.tsukuba.ac.jp> wrote:

    # Just too ugly for me!
    def foo(x=lambda: random.randint(0,9)):

        x = x()
        # ...

I think this is a perfect example of where my desired "delayed" (or "deferred") construct would be great.  There are lots of behaviors that I have not thought through, and do not specify here.  But for example:

def foo(a=17, b=42,, x=delayed randint(0,9), y=delayed randrange(1,100)):

    if something:

        # The simple case is realizing a direct delayed

        val = concretize x

    elif something_else:

        # This line creates a call graph, not a computation

        z = ((y + 3) * x)**10

        # Still call graph land

        w = a / z

        # Only now do computation (and decide randoms)

        val = concretize w - b