@@ -3142,17 +3142,20 @@ objects. The :mod:`collections.abc` module provides a
31423142:term: `abstract base class ` to help create those methods from a base set of
31433143:meth: `~object.__getitem__ `, :meth: `~object.__setitem__ `,
31443144:meth: `~object.__delitem__ `, and :meth: `!keys `.
3145- Mutable sequences should provide methods :meth: `~sequence.append `,
3146- :meth: `~sequence.count `, :meth: `~sequence.index `, :meth: `~sequence.extend `,
3147- :meth: `~sequence.insert `, :meth: `~sequence.pop `, :meth: `~sequence.remove `,
3148- :meth: `~sequence.reverse ` and :meth: `!sort `,
3145+ 3146+ Mutable sequences should provide methods
3147+ :meth: `~sequence.append `, :meth: `~sequence.clear `, :meth: `~sequence.count `,
3148+ :meth: `~sequence.extend `, :meth: `~sequence.index `, :meth: `~sequence.insert `,
3149+ :meth: `~sequence.pop `, :meth: `~sequence.remove `, and :meth: `~sequence.reverse `,
31493150like Python standard :class: `list ` objects.
31503151Finally, sequence types should implement addition (meaning concatenation) and
31513152multiplication (meaning repetition) by defining the methods
31523153:meth: `~object.__add__ `, :meth: `~object.__radd__ `, :meth: `~object.__iadd__ `,
31533154:meth: `~object.__mul__ `, :meth: `~object.__rmul__ ` and :meth: `~object.__imul__ `
31543155described below; they should not define other numerical
3155- operators. It is recommended that both mappings and sequences implement the
3156+ operators.
3157+ 3158+ It is recommended that both mappings and sequences implement the
31563159:meth: `~object.__contains__ ` method to allow efficient use of the ``in ``
31573160operator; for
31583161mappings, ``in `` should search the mapping's keys; for sequences, it should
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