Python Python中的迭代器

# coding:utf-8

iter_obj = iter((1, 2, 3))
# print(next(iter_obj))
# print(next(iter_obj))
# print(next(iter_obj))

# print(next(iter_obj))


def _next(iter_obj):
    try:
        return next(iter_obj)
    except StopIteration:
        return None


# print(_next(iter_obj))
# print(_next(iter_obj))
# print(_next(iter_obj))
# print(_next(iter_obj))
# print(_next(iter_obj))

def make_iter():
    for i in range(10):
        yield i


iter_obj = make_iter()
# print(type(iter_obj))

for i in iter_obj:
    print(i)
print('--------')
for i in iter_obj:
    print(i)  # 执行后程序会空 , 拿不到数据

iter_obj = (i for i in range(10))

for i in iter_obj:
    print(i)
print('========')
for i in iter_obj:
    print(i)