In [1]:
def fib(x):
    if x == 0 or x == 1:
        return 1
    else:
        return fib(x - 2) + fib(x - 1)

In [2]:
for i in range(11):
    print(i,fib(i))


0 1
1 1
2 2
3 3
4 5
5 8
6 13
7 21
8 34
9 55
10 89

In [ ]: