On Thursday, August 22, 2013 2:36:49 PM UTC-7, Simon King wrote:
>
>
> We have lazy_string and lazy_format. Note that #14585 suggest a cython
> version of them.
>
> Yes, I'm aware of those :-) and that should alleviate costs somewhat.
However, a call
verbose(lazy_string("computing %s x %s ...",self.nrows(),self.ncols()))
would still result in the creation of a (somewhat cheaper) lazy string
object, and the self.nrows() and self.ncols() method calls, even in cases
where the verbosity is not required. That's a difference between verbose
logging and exception raising: In the former case we know at the position
of invocation whether the call will have an effect, whereas in the latter
we don't have access to the context that will determine if the exception
gets caught or printed.
That's why I think the cost is a little less acceptable for verbose
messages. The code SHOULD read:
if (verbose.level > ...): verbose("....")
which is of course a bit awkward to type (but it's still a one-liner!).
That's why I thought that it might be feasible to write some inline
function or macro that would produce the desired code while keeping the
convenience of putting a single statement in the source.
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