while循环镶嵌if，if执行后为何while不再执行？（python3）

Question

a=[1,2,3,4,5];b=[1,2,3,4,5];c=[1,2,3,4,5];m=0;n=0;o=0
while m < 5:
    while n < 5:
        while o < 5:
            if a[m]+b[n]+c[o] == 5:
                print(a[m],b[n],c[o])
            o = o+1
        o = 0
        n = n+1
    n=0
    m=m+1

Answer 1

没看出来啥问题啊？

Answer 2

是编译器出问题了