使用两种方式进行计算
def fib(n): if n==0: return 0 elif n==1: return 1 else: return fib(n-1)+fib(n-2) def fib2(n): a=0 b=1 for x in range(n): a=a+b b=a-b return a if __name__ == "__main__": for x in range(10): print(x,fib(x),fib2(x))