求解答关于数据无法成功写入.csv文件

with open("result1.csv","w") as csvfile:
    data=[]
    data.append(1)
    data.append(2)
    data.append(3)
    #datas=[]
    writer = csv.writer(csvfile)
    writer.writerow(["a","b","c"])
    for x in range(1,10000):
        for y in range(1,10000):
            if (zhishu(x,y)==1 and z<=10000) :
                z = math.sqrt(x*x+y*y)
                n=int(z)
                if ((z-float(n))==0):
                    #writer.writerow([x,y,n])
                    data[0]=x
                    data[1]=y
                    data[2]=n
                    print(x,y,n)
                    #print(data)
                    writer.writerow(data)