line = "After fresh rain in mountains bare "
print(line.title())


a = float(input("输入三角形第一条直角边长："))
b = float(input("输入三角形第二条直角边长："))
area=(a*b)/2
print("直角三角形的面积为：{:.1f}".format(area))



num = eval(input("输入数字："))
print("对应的二进制数：{0:b}\n八进制数：{0:o}\n十六进制数：{0:X}".format(num))#注意0




import turtle
turtle.color('black','yellow')
turtle.begin_fill()
turtle.circle(50)
turtle.end_fill()



def judge_year(year):
    if (year%4==0 and year%100!=0) or year%400==0:
        print(year,"年是闰年")
    else:
        print(year,"年不是闰年")#有空格
year = eval(input("请输入年份："))
judge_year(year)




    fi = open("score.csv","r")
    fo = open("avg-score.txt","w")
    ls = []
    x = []
    sum = 0
    for row in fi:
        ls.append(row.strip("\n").split(","))
    for line in ls[1:]:
        for i in line[1:]:
            sum+=int(i)
            avg=sum/3
        x.append(avg)
        sum=0
    fo.write("语文：{:.2f}\n数学：{:.2f}\n英语：{:.2f}\n物理：{:.2f}\n科学：{:.2f}\n".format(x[0],x[1],x[2],x[3],x[4]))
    fi.close()
    fo.close()