用while计算1/2+1/4+1/6+……1/100

用的Python，不晓得怎么的写上去运行不出结果，界面也没显示错误

i=2
sum = 0
while i<=100:
    sum += 1/i
    i+=2
print(sum)

    n=2
    sum=0
    while n <= 100:
        sum = sum + (1 / float(n))
        n = n + 2
    print(sum)