enumerate函数

既需要遍历索引同时需要遍历元素的时候，可以考虑使用enumerate函数，enumerate函数接受一个可遍历的对象，如列表、字符串

s = string.ascii_lowercase e = enumerate(s) print(s) print(list(e))  abcdefghijklmnopqrstuvwxyz  [(0, 'a'), (1, 'b'), (2, 'c'), (3, 'd'), (4, 'e'), (5, 'f'), (6, 'g'), (7, 'h'), (8, 'i'), (9, 'j'), (10, 'k'), (11, 'l'), (12, 'm'), (13, 'n'), (14, 'o'), (15, 'p'), (16, 'q'), (17, 'r'), (18, 's'), (19, 't'), (20, 'u'), (21, 'v'), (22, 'w'), (23, 'x'), (24, 'y'), (25, 'z')]