> On 7 May 2018, at 18:52, Guido van Rossum <[email protected]> wrote:
>
> On Mon, May 7, 2018 at 6:24 AM, Serhiy Storchaka <[email protected]
> <mailto:[email protected]>> wrote:
> I just don't understand why you need a new keyword for writing runtime checks.
>
> Oh, that's pretty clear. The OP wants to be able to turn these checks off
> with some flag he can set/clear at runtime, and when it's off he doesn't want
> to incur the overhead of evaluating the check. The assert statement has the
> latter property, but you have to use -O to turn it off. He basically wants a
> macro so that
>
> runtime_assert(<expr>)
>
> expands to
>
> if <controlling flag> and (<expr>):
> raise AssertionError
>
> In Lisp this would be easy. :-)
This idea requires the same sort of machinery in python that I was hoping for
to implement the short circuit logging.
My logging example would be
log( control_flag, msg_expr )
expanding to:
if <control_flag>:
log_function( <msg_expr> )
Barry
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