实例讲解Python迭代器的概念

1、打开Python开发工具IDLE,新建‘iter.py’文件，编写代码如下：from collections.abc import Iterablelist1 = [x for x in range(5)]print (isinstance(list1,Iterable))

2、F5运行程序，列表属于可迭代对象，isinstance方法判断为true

3、列表转换为迭代器，代码如下：from collections.abc import Iterablelist1 = [x for x in range(5)]print (isinstance(list1,Iterable))ilist = iter(list1)print (type(ilist))

4、F5运行程序，列表转换成迭代器

5、迭代器有next方法，代码如下：from collections.abc import Iterablelist1 = [x 熠硒勘唏for x in range(5)]print (isinstance(list1,Iterable))ilist = iter(list1)print (type(ilist))print (next(ilist))print (ilist.__next__())

6、F5运行程序，next执行，迭代器读取内容

7、for循环遍历螽啸镥释相当于最后捕捉了迭代器最后一个next方法的异常，代码如下：from collections.abc import Iterable造婷用痃list1 = [x for x in range(5)]print (isinstance(list1,Iterable))ilist = iter(list1)print (type(ilist))print (next(ilist))print (ilist.__next__())while 1: try: print (next(ilist)) except StopIteration: break

8、F5运行程序，迭代器取完内容，异常被捕获，while循环结束