help enumerate：
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]), ...
| methods defined here:
| __getattribute__(...)
| x.__getattribute__('name') <==> x.name
| __iter__(...)
| x.__iter__() <==> iter(x)
| next(...)
| x.next() -> the next value, or raise stopiteration
| data and other attributes defined here:
| __new__ =
| t.__new__(s, ...) -> a new object with type s, a subtype of t
返回迭代器的索引值和元素;
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