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# 练习高级特性的迭代器

from collections import Iterable, Iterator

l = [1, 3, 5]

t = (1, 6, 5)

s = 'dsjk'

# 判断是否可迭代

print(isinstance(l, Iterable))

print(isinstance(t, Iterable))

print(isinstance(s, Iterable))

# 判断是否是迭代器,可以看出，这三个都不是迭代器

print(isinstance(l, Iterator))

print(isinstance(t, Iterator))

print(isinstance(s, Iterator))

# 判断生成器是否是迭代器,是的

print(isinstance((x for x in range(3)), Iterator))

# 同时也是可迭代的

print(isinstance((x for x in range(3)), Iterable))

# 我们可以将list，tuple，和string转成迭代器,这时就是迭代器了

print(isinstance(iter(l), Iterator))

print(isinstance(iter(t), Iterator))

print(isinstance(iter(s), Iterator))

# 其实for循环就是通过next来不断获取下一个元素的，直到抛出异常StopIteration