iter
iter(iterable)
iterable
: 可迭代的数据类型 next
next(iterator)
iterator
: 迭代器对象yield
# 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)