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

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

The patch is fine.  Do consider using assertIsNot() in the tests.  Then go ahead and apply it.

The OverflowError in bytearray.pop() is a bug, please open a separate report for it and make a patch changing it to IndexError.  Assign that bug report to me.

Go ahead and propose a patch for MutableSequence.clear() implemented with MutableSequence.pop() and catching an IndexError when empty.

Thanks for your efforts.

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