[Python-ideas] PEP 505: None-aware operators

[Steven D'Aprano]

On Sun, Jul 22, 2018 at 11:26:15PM +1000, Chris Angelico wrote:

> You forget that the operator will *short-circuit*. It will not
> evaluate the second argument if the first argument is None. You cannot
> do this with a function, other than with a hack like a lambda
> function.

We keep running up to this issue. What if there was a language 
supported, non-hackish way to officially delay evaluation of 
expressions until explicitly requested?

That would allow us to write a function:

func(arg, default = delayed-expression)

and avoid new punctuation. Then the only bike-shedding will be where the 
function should live and what it is called and how many arguments it 
ought to take...


-- 
Steve