[Python-Dev] 51 Million calls to _PyUnicodeUCS2_IsLinebreak() (???)

["Martin v. Löwis"]

Walter Dörwald wrote:
> I think a maxsplit argument (just as for unicode.split()) would help too.

Correct - that would allow to get rid of the quadratic part.
We should also strive for avoiding the second copy of the line,
if the user requested keepends.

I wonder whether it would be worthwhile to cache the .splitlines result.
An application that has just invoked .readline() will likely invoke
.readline() again. If there is more than one line left, we could return
the first line right away (potentially trimming the line ending if
necessary). Only when a single line is left, we would attempt to
read more data. In a plain .read(), we would first join the lines
back.

Regards,
Martin