Python3.6装饰器decorator程序只输出时间没有函数值？

Question

import time import functools def performance(f):     def timeit(x):         start = time.clock()         f(x)         end = time.clock()         return end - start     return timeit @performance def factorial(n):     return functools.reduce(lambda x, y: x * y, range(1, n+1)) print(factorial(10))

Answer 1

import time
import functools
def performance(f):
    def timeit(x):
        start = time.clock()
        end = time.clock()
        print('Used: ', end - start)
        return f(x)
    return timeit
@performance
def factorial(n):
    return functools.reduce(lambda x, y: x * y, range(1, n+1))
print(factorial(10))

只能通过单独在timeit()函数内用print()输出时间......