enumerate()函数是会返回index（下标）和value（值）的函数 实际上，enumerate()在每次循环中，返回的是一个包含两个元素的定值表(tuple)，两个元素分别赋予index和value。
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"""Docstring:enumerate(iterable[, start]) -> iterator for index, value of iterableReturn an enumerate object. iterable must be another object that supportsiteration. The enumerate object yields pairs containing a count (fromstart, 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]), ...Type: type"""新闻热点
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