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

[Georg Brandl]

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

Yes, list_clear should be called, but no, it cannot be used directly because a method needs a PyObject* return value.  So a wrapper method is needed that looks like listappend() does for list.append(). list_copy() will just look like list_slice() with the index fiddling removed.

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nosy: +georg.brandl

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