from random import randint

list = [["" ,"阿大" ],
        ["" ,"小二" ],
        ["" ,"张三" ],
        ["" ,"李四" ],
        ["" ,"王五" ],
        ]


for i in range(0,5):
    list[i][0] = 20170000+randint(0,10000)
    for j in range(0,3):
        list[i].append(randint(60,100))


aug=0
for i in range(len(list)):
    aug = (list[i][2] + list[i][3] + list[i][4])/3
    aug_1 = float("{0:.2f}".format(aug))
    list[i].append(aug_1)


print("学号       姓名  Java C语言 Python 平均分")
for i in list:
    for j in i:
        print(j,end="   ")
    print("\t")


aug_j,aug_c,aug_p,max = 0,0,0,0
n = len(list)
min = list[0][2]
for i in range(len(list)):
    aug_j += list[i][2]
    aug_c += list[i][3]
    aug_p += list[i][4]
    for j in range(2, 5):
        if(list[i][j]>max):
            max =list[i][j]
        if(list[i][j]<min):
            min =list[i][j]

print("Java的平均值：{}\nC语言的平均值：{}\nPython的平均值：{}\n最大值：{}\n最小值：{}".format(aug_j,aug_c,aug_p,max,min))

money = input("请输入需要兑换的货币:")
try:
    
    if money[0]=='$':
        rmb = eval(money[1:]) * 6
        print("兑换后的货币为:Y{:.2f}".format(rmb)) 
    elif money[0]=='Y':
        dollar = eval(money[1:]) / 6
        print("兑换后的货币为:${:.2f}".format(dollar))
    else:
        print("输入错误，请重新输入")
except:
    exit(0)

https://gitee.com/Miracle-Fan/codes/ahjvd35yui1c42qmleoxw10