python 自定义一个数字列表，求列表中第二大数的下标

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#自定义一个数字列表，求列表中第二大数的下标
# ages = [1, 2, 15, 4, 11, 12, 19, 8, 20, 18]
# max1 = 0
# max2 = 0
# for i in range(len(ages)):
#     if ages[i] > ages[max1]:
#         max2 = max1
#         max1 = i
#     elif ages[i] > ages[max2]:
#         max2 = i
# print(max2)
#