南京大学：《计算机程序的构造和解释 Structure and Interpretation of Computer Programs》课程教学资源（PPT课件讲稿）13-Iterators

Iterators

Iterators

Announcements

Announcements

Iterators

Iterators

Iterators m

Iterators 4

Iterators A container can provide an iterator that provides access to its elements in order n

Iterators 4 A container can provide an iterator that provides access to its elements in order

Iterators A container can provide an iterator that provides access to its elements in order iter(iterable):Return an iterator over the elements of an iterable value next(iterator):Return the next element in an iterator n

Iterators 4 A container can provide an iterator that provides access to its elements in order iter(iterable): next(iterator): Return an iterator over the elements of an iterable value Return the next element in an iterator

Iterators A container can provide an iterator that provides access to its elements in order iter(iterable):Return an iterator over the elements of an iterable value >>5=[3,4,5] next(iterator):Return the next element in an iterator n

Iterators 4 A container can provide an iterator that provides access to its elements in order iter(iterable): next(iterator): Return an iterator over the elements of an iterable value Return the next element in an iterator >>> s = [3, 4, 5]

Iterators A container can provide an iterator that provides access to its elements in order iter(iterable):Return an iterator over the elements of an iterable value >>5=[3,4,5] >>t iter(s) next(iterator):Return the next element in an iterator n

Iterators 4 A container can provide an iterator that provides access to its elements in order iter(iterable): next(iterator): Return an iterator over the elements of an iterable value Return the next element in an iterator >>> s = [3, 4, 5] >>> t = iter(s)

Iterators A container can provide an iterator that provides access to its elements in order iter(iterable):Return an iterator over the elements of an iterable value V >>5=[3,4,5] >>t iter(s) next(iterator):Return the next element in an iterator n

Iterators 4 A container can provide an iterator that provides access to its elements in order iter(iterable): next(iterator): Return an iterator over the elements of an iterable value Return the next element in an iterator >>> s = [3, 4, 5] >>> t = iter(s)

Iterators A container can provide an iterator that provides access to its elements in order iter(iterable):Return an iterator over the elements of an iterable value V >>5=[3,4,5] >>t iter(s) next(iterator):Return the next element in an iterator >>next(t) 3 n

Iterators 4 A container can provide an iterator that provides access to its elements in order iter(iterable): next(iterator): Return an iterator over the elements of an iterable value Return the next element in an iterator >>> s = [3, 4, 5] >>> t = iter(s) >>> next(t) 3