enumerate() 函数用于将一个可遍历的数据对象(如列表、元组或字符串)组合为一个索引序列,同时列出数据和数据下标,一般用在 for 循环当中。
示例如下:
普通的for循环
>>>i = 0 >>> seq = ['one', 'two', 'three'] >>> for element in seq: ... print i, seq[i] ... i +=1 ... 0 one 1 two 2 three
for循环使用enumerate
>>>seq = ['one', 'two', 'three'] >>> for i, element in enumerate(seq): ... print i, seq[i] ... 0 one 1 two 2 three