[issue10516] Add list.clear() and list.copy()

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

Hmm, shouldn't self.__class__(self) be a good default implementation of copy()?

I'd expect any sequence to support this way of creation from another sequence, even if it's inefficient.

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<http://bugs.python.org/issue10516>
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