Stefan Behnel added the comment:

How about actually allowing a list in addition to a tuple? And, in fact, any 
sequence? I can't see a reason not to.

For reference, lxml only expects it to be either None or an iterable. 
Essentially, I consider it more of a set-like filter, since the linear aspect 
of a tuple/list/sequence has no meaning for it.

----------
components: +XML
nosy: +eli.bendersky, scoder
type:  -> behavior

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<http://bugs.python.org/issue19452>
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