[Python-Dev] Re: PEP 0008 confusion - here it is, but don't use it?

[Terry Reedy]

"Martin v. Löwis" <martin at v.loewis.de> wrote in message
news:4113E512.8050407 at v.loewis.de...
> > I'm a bit confused.  Why bother to speed up s+=t if we aren't supposed
to
> > use it?
>
> Because it helps users who aren't aware of the problem, and use the
> obvious approach. Developers of the standard libraries are supposed to
> know, and use the "better, but non-obvious" technique.

Also, users are freer to discard cross implementation portability than
library.  Dependence on ref counting to close files is another example.

tjr