Python enumerate() 函数如何实现索引功能

1.描述：

enumerate()函数用于将一个可遍历的数据对象(如列表，元组，字符串)组合为一个索引序列，同时列出数据和数据索引(下标)，一般用于for循环当中

2.语法

enumerate(sequence, [start=0])

3.参数：

4.返回值

返回enumerate(枚举)对象

5.实例

list1 = [10,20,30,40,'maple','yf',60]tup1 = (100,200,300,400,'hao','qazert',600)str1 = '1234qwertjdsa22323'for index1,item1 in enumerate(list1): print('index1 = %d, item1 = %s' %(index1,item1,))print('------------------------------')for index2, item2 in enumerate(list1,start = 2): print('index2 = %d, item2 = %s' %(index2,item2,))print('******************************')for index3,item3 in enumerate(tup1): print('index3 = %d, item3 = %s' % (index3, item3,))print('==============================')for index4,item4 in enumerate(tup1, start = 4): print('index4 = %d, item4 = %s' % (index4, item4,))print('%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%')for index5,item5 in enumerate(str1): print('index4 = %d, item4 = %s' % (index5, item5,))print('$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$')for index6,item6 in enumerate(str1,start = 6): print('index4 = %d, item4 = %s' % (index6, item6,)) #输出的结果如下：index1 = 0, item1 = 10index1 = 1, item1 = 20index1 = 2, item1 = 30index1 = 3, item1 = 40index1 = 4, item1 = mapleindex1 = 5, item1 = yfindex1 = 6, item1 = 60------------------------------index2 = 2, item2 = 10index2 = 3, item2 = 20index2 = 4, item2 = 30index2 = 5, item2 = 40index2 = 6, item2 = mapleindex2 = 7, item2 = yfindex2 = 8, item2 = 60******************************index3 = 0, item3 = 100index3 = 1, item3 = 200index3 = 2, item3 = 300index3 = 3, item3 = 400index3 = 4, item3 = haoindex3 = 5, item3 = qazertindex3 = 6, item3 = 600==============================index4 = 4, item4 = 100index4 = 5, item4 = 200index4 = 6, item4 = 300index4 = 7, item4 = 400index4 = 8, item4 = haoindex4 = 9, item4 = qazertindex4 = 10, item4 = 600%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%index4 = 0, item4 = 1index4 = 1, item4 = 2index4 = 2, item4 = 3index4 = 3, item4 = 4index4 = 4, item4 = qindex4 = 5, item4 = windex4 = 6, item4 = eindex4 = 7, item4 = rindex4 = 8, item4 = tindex4 = 9, item4 = jindex4 = 10, item4 = dindex4 = 11, item4 = sindex4 = 12, item4 = aindex4 = 13, item4 = 2index4 = 14, item4 = 2index4 = 15, item4 = 3index4 = 16, item4 = 2index4 = 17, item4 = 3$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$index4 = 6, item4 = 1index4 = 7, item4 = 2index4 = 8, item4 = 3index4 = 9, item4 = 4index4 = 10, item4 = qindex4 = 11, item4 = windex4 = 12, item4 = eindex4 = 13, item4 = rindex4 = 14, item4 = tindex4 = 15, item4 = jindex4 = 16, item4 = dindex4 = 17, item4 = sindex4 = 18, item4 = aindex4 = 19, item4 = 2index4 = 20, item4 = 2index4 = 21, item4 = 3index4 = 22, item4 = 2index4 = 23, item4 = 3

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