Jon Forrest <nob...@gmail.com>: > On 6/3/2017 5:23 PM, Steve D'Aprano wrote: >> On Sun, 4 Jun 2017 05:10 am, Jon Forrest wrote: > >> We can fix the book's statement by changing it to: >> >> A sequence is an ordered collection of *elements* ... > > That's exactly what I was thinking, but then there'd have to > be a clear definition of "element".
Instead of getting into metaphysical explanations, one should define the concepts operationally. A *sequence* is an object s that supports (most of) these operations: x in s x not in s s + t s * n n * s s[i] s[i:j] s[i:j:k] len(s) min(s) max(s) s.index(x[, i[, j]]) s.count(x) <URL: https://docs.python.org/3/library/stdtypes.html#common-sequenc e-operations> As sequence is *mutable* if it additionally supports (most of) these operations: x[i] = x x[i:j] = t del s[i:j] s[i:j:k] = t del s[i:j:k] s.append(x) s.clear() s.copy() s.extend(t) s += t s *= t s.insert(i, x) s.pop([i]) s.remove(x) s.reverse() <URL: https://docs.python.org/3/library/stdtypes.html#mutable-sequenc e-types> Marko -- https://mail.python.org/mailman/listinfo/python-list
