[issue18850] xml.etree.ElementTree accepts control chars.

[Michele Orrù]

Michele Orrù added the comment:

> Incidentally I read today http://blastedbio.blogspot.co.uk/2012/05/blast-tabular-missing-descriptions.html mentioning ^A being used. 
> Maybe that would stop working?
I don't see any problem in any xml output. Indeed:
"You can't put a nasty non-printing ASCII character in XML, so they were switched to something else. That is my working theory for this anyway."

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<http://bugs.python.org/issue18850>
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