Santoso Wijaya <santoso.wij...@gmail.com> added the comment:

This does not only affect `append`, but also, `insert`, `extend`, etc.

In fact, the list-like operations on Element are merely forwarded to its 
`_children` (a list) field. Should we really type check these methods' 
arguments each? Doesn't strike as Pythonic to me...

OTOH, in cElementTree, by virtue of C-API's tuple unpacking convention, the 
argument's type is always strictly checked prior to accessing the children list.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue13782>
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