[issue18003] lzma module very slow with line-oriented reading.

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Perhaps this change is worth to mention in whatsnews. Could you add this Martin?

It would be nice also add tests to ensure that next() after closing the file always raises ValueError.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18003>
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