Re: (not) handling new programming idioms with grace

[Pierre Chapuis <catwell@...>]

On Mon, Jul 16, 2018, at 03:17, Daurnimator wrote:

> What doesn't nicely translate to lua is what to do in the `yield` case:
> 
> local function foo()
>     with bar do
>         coroutine.yield(baz) -- maybe baz contains something based on `bar`
>     end
> end
> local f = coroutine.wrap(foo)
> f()
> if xyz then -- only *maybe* does the coroutine get resumed
>     f()
> end

I was unsure how that was dealt with in Python. This code:

    class Foo(object):

        def __init__(self):
            pass

        def __enter__(self):
            print("enter")
            return self

        def __exit__(self, *args):
            print("exit")

    foo = Foo()

    def my_gen_f():
        while True:
            with foo:
                yield True

    def f():
        my_gen = my_gen_f()
        next(my_gen)
        print("after")

    f()

    print("finally")

prints:

    enter
    after
    exit
    finally

This is unrelated to the GC, disabling it does not change the output.