【python3.8】斐波拉契数列实现

import  time

def memoize(f):
    memo = {}
    def helper(x):
        if x not in memo:
            memo[x] = f(x)
        return memo[x]
    return helper

@memoize
def fib(n):
    if n == 0:
        return 0
    elif n == 1:
        return 1
    else:
        return fib(n-1) + fib(n-2)


def fib_seq(n):
    res = []
    if n > 0:
        res.extend(fib_seq(n-1))
    res.append(fib(n))
    return res

# 耗时：7.870000000000099e-05
start_using_list = time.perf_counter()
fib_seq(30)
end_using_list = time.perf_counter()
print(f'耗时：{end_using_list-start_using_list}')


# def fib(n):
#     if n == 0:
#         return 0
#     elif n == 1:
#         return 1
#     else:
#         return fib(n-1) + fib(n-2)
#
# def fib_seq(n):
#     res = []
#     if n > 0:
#         res.extend(fib_seq(n-1))
#     res.append(fib(n))
#     return res

# # 耗时：1.2619506
# start_using_list = time.perf_counter()
# fib_seq(30)
# end_using_list = time.perf_counter()
# print(f'耗时：{end_using_list-start_using_list}')