Fibonacci数列

In [1]: def fib(n):
   ...:     (a, b) = (0, 1)
   ...:     while a < n:
   ...:         print(a, end = ' ')
   ...:         a, b = b, a + b
   ...: 
In [2]: fib(100)
0 1 1 2 3 5 8 13 21 34 55 89