初学者求助：怎样能使输出结果为3 4

list1=[0,1,2,3,4,5]

i=0

while True:

    a=1

    b=2

    i=i+1

    if list1[i]=='2':

        a=3

        b=4

        break

    else:

        continue

print(a,b)

去掉引号

    if list1[i]==2: