python next 方法(next()方法)

返回迭代器的下一个项目。要和生成迭代器的 iter() 函数一起使用。

>>> help(next)

# output:
Help on built-in function next in module builtins:

next(...)
	## 使用方法：
    next(iterator[, default])
    
    Return the next item from the iterator. If default is given and the iterator
    is exhausted, it is returned instead of raising StopIteration.

>>> a = [0,1,2,3,4]
>>> a = iter(a)
>>> next(a), next(a)

# output:
(0, 1)