[Python-Dev] PEP 278 - finished?

[Gustavo Niemeyer]

> This is answered by the PEP:
> 
> A partial output implementation, where strings passed to fp.write()
> would be converted to use fp.newlines as their line terminated but
> all other output would not is far too surprising, in my view.
>
> Because there is no output support for universal newlines there is
> also no support for a mode "rU+": the surprise factor of the
> previous paragraph would hold to an even stronger degree.

I've read that, but I don't agree with the second paragraph. Universal
newline support is available only for input. This sentence is enough to
easily predict the behavior in every usage case, including "+" modes.

If there's any intent to add support to output, then I'd understand
the exclusion, since this would make backwards compatibility possible
(users of "rU+" could have their code broken, since they were doing
output by hand). Otherwise, it should be allowed, IMO.

-- 
Gustavo Niemeyer

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