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

[Raymond Hettinger]

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

Guido approved these both in a thread earlier this year.

The reasoning for copy() was the same as for clear(), some folks couldn't cope with:

   b = a[:]

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nosy: +rhettinger
title: Add list.clear() -> Add list.clear() and list.copy()

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