【Python 训练营】N_5 斐波那契数列

# 方法一
def fib1(n):
    a,b = 1,1
    for i in range(n-1):
        a,b = b,a+b
    return a
f1 = []
for i in range(1,11):
    f1.append(fib1(i))
print(f1)


# 方法二
def fib2(n):
    if n==1 or n==2:
        return 1
    return fib2(n-1) + fib2(n-2)
f2 = []
for i in range(1,11):
    f2.append(fib2(i))
print(f2)

# 方法三
def fib3(n):
    if n==1:
        return [1]
    if n==2:
        return [1,1]
    fibs = [1,1]
    for i in range(2,n):
        fibs.append(fibs[-1] + fibs[-2])
    return fibs
print(fib3(10))

# 输出 [1, 1, 2, 3, 5, 8, 13, 21, 34, 55]