Issue 6874: sequence method .count() and .index() shoud be in immutable sequence method list. (original) (raw)

In document 6.6.4. Mutable Sequence Types says: The following operations are defined on mutable sequence types: s.count(x) return number of i‘s for which s[i] == x s.index(x[, i[, j]]) return smallest k such that s[k] == x and i <= k < j (4)

here, s.count() and s.index() maybe should in immutable sequence types operations list.