python enumerate()

enumerate(iterabe[，start])

这个函数是一个迭代器？

可以给一个迭代器后面[]是起始的位置

 如果[]中给了10则会从10开始

 

class enumerate(object):
    """
    enumerate(iterable[, start]) -> iterator for index, value of iterable
    
    Return an enumerate object.  iterable must be another object that supports
    iteration.  The enumerate object yields pairs containing a count (from
    start, which defaults to zero) and a value yielded by the iterable argument.
    enumerate is useful for obtaining an indexed list:
        (0, seq[0]), (1, seq[1]), (2, seq[2]), ...
    """

example:
 ===============================
>>> a=enumerate(range(5),4)
>>> a
<enumerate object at 0x000001B4AD750BD0>
>>> print(a)
<enumerate object at 0x000001B4AD750BD0>
>>> for i,j  in a:
	print(i,j)

	
4 0
5 1
6 2
7 3
8 4
>>>