一、self.*與getattr的速度對比（Python中的AI對比實驗）

• 2020 年 4 月 21 日
• AI
• Python

完整代碼如下：

# -*- coding: UTF-8 -*-

# Author: Perry
# @Create Time: 2020-04-06 12:56

import timeit
import numpy as np


class A(object):
    def __init__(self):
        self.one = 1

    def use(self):
        tmp = self.one


class B(object):
    def __init__(self):
        self.one = 1

    def use(self):
        tmp = getattr(self, "one")


if __name__ == '__main__':
    A_exp = A()
    B_exp = B()

    repeat = 10
    number = 100000

    A_time = timeit.repeat("A_exp.use()", "from __main__ import A_exp", repeat=repeat, number=number)
    A_time = np.mean(A_time)
    print("A time is: ", A_time)

    B_time = timeit.repeat("B_exp.use()", "from __main__ import B_exp", repeat=repeat, number=number)
    B_time = np.mean(B_time)
    print("B time is: ", B_time)

輸出結果：

A time is:  0.011411738799999998
B time is:  0.015067042500000022

結論：可以看到使用self > getattr，但是沒有超過太多。