[issue7139] ElementTree: Incorrect serialization of end-of-line characters in attribute values

[Moriyoshi Koizumi]

Moriyoshi Koizumi <mozo+python at mozo.jp> added the comment:

@ezio.melotti

Yes, it works flawlessly as for parsing. 

Fixing this would actually break the current behavior, but I believe 
this is how it should work.

It seems #5752 pretty much says the same thing.

@effbot

As specified in 2.11 End-of-Line Handling [2], any variants of EOL 
characters should have been normalized into single #xa before it 
actually gets parsed, so bare #xd characters would never appear as they 
are amongst parsed information items.


[2] http://www.w3.org/TR/xml/#sec-line-ends

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<http://bugs.python.org/issue7139>
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