ls = [3, 1, 2, 5, 4] # for v in ls: #     print(v) # count = 0 # while count < len(ls): #     print(str(count + 1) + '次循环：' + str(ls[count])) #     count += 1 # 枚举对象：为迭代器对象产生迭代索引 print(list(enumerate(ls))) for i, v in enumerate(ls):     print(str(i + 1) + '次循环：' + str(v)) dic = {'a': 100, 'b': 200} print(list(enumerate(dic)))