this seems nice.
It just seems that the obvious way to do it would be:
def tap(iter_, func):
for item in iter_:
func(item)
yield item
I think it can be nice, but more as cookbook material than an actual
itertools function.
On Sun, 25 Oct 2020 at 14:38, <[email protected]> wrote:
> On 2020-10-25 at 16:34:14 +0000,
> George Harding <[email protected]> wrote:
>
> > some_iter = map(lambda x: x if print(x) else x, some_iter)
> >
> > The tuple has a ~50% overhead, the case statement ~15%, compared to the
> > generator.
>
> def print_first(x):
> print(x)
> return x
> new_iter = map(print_first, some_iter)
>
> No extranous tuple, no extranous case stament. Newlines are cheap these
> days. The call to print, however, is possibly unbounded in time and
> space.
>
> If you really want to go overboard, put something like the following
> peeker function into your personal toolbox (untested):
>
> def peeker(function):
> def peeker(x):
> function(x)
> return x
> return peeker
>
> And use it like this:
>
> new_iter = map(peeker(print), some_iter)
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