我无法使此代码正常工作？这段代码应该找出程序为 find[42] 花费了多长时间这是一个 python 代码

Question

当我尝试运行这段代码时，我应该获取程序定位的时间值 [42] 但我一直收到错误

import random
import time

ranges = [1000, 10000, 100000, 1000000]

dict_times = []
index_times = []
sort_times = []

for i in ranges:

    L = random.sample(range(i), i)
    d = dict(zip(L,L))

    #time for dict ------

    #start the time here
    start = time.time()

    v = d[42]

    #end the time here
    end = time.time()

    dict_times.append(end-start)

    #time for index ------

    #start the time here
    start = time.time()

    ind = L.index(42)

    #end the time here
    end = time.time()

    index_times.append(end-start)

    #time for sort -----

    #start the time here
    start = time.time()

    L = sorted(L)

    #end the time here
    end = time.time()

    sort_times.append(end-start)

print('Times for dictionary lookup:', dict_times, end="\n\n")

print('Times for list lookup:', index_times)
index_ratios = [round(index_times[i]/index_times[i-1], 2) for i in range(1, len(index_times))]
print('List lookup Ratios:', index_ratios, end="\n\n")


print('Times for list sort:', sort_times)
sort_ratios = [round(sort_times[i]/sort_times[i-1], 2) for i in range(1, len(sort_times))]
print('List sort Ratios:', sort_ratios, end="\n\n")

list_sort_over_index = [round(sort_times[i]/index_times[i], 2) for i in range(len(sort_times))]
print('List sort over list lookup:', list_sort_over_index, end="\n\n")

我得到的错误是：第 57 行，在 index_ratios = [round(index_times[i]/index_times[i-1], 2) for i in range(1, len(index_times) 我得到的完整错误是：

运行文件('C:/Users/sanil/OneDrive/Desktop/Business App Developement/hw9/turnin/hw09.py.py', wdir='C:/Users/sanil/OneDrive/Desktop/Business App Developement/hw9/turnin', current_namespace=True) 查字典次数：[0.0, 0.0, 0.0, 0.0]

列表查找次数：[0.0, 0.0, 0.0, 0.03130626678466797] 回溯（最近调用最后）：

文件“C:\Users\sanil\OneDrive\Desktop\Business App Developement\hw9\turnin\hw09.py.py”，第 57 行，在 index_ratios = [round(index_times[i]/index_times[i-1], 2) for i in range(1, len(index_times))]

ZeroDivisionError: 浮点除以零我在 sypder 中运行宁此代码，我是否遗漏了应用程序中的任何插件，无论我运行代码我得到多少次相同的错误

Answer 1

尝试使用 time.perf_counter()，将代码中 time.time() 的所有实例替换为 time.perf_counter()。

来自time.time()documentation,

[n]ote that even though the time is always returned as a floating point number, not all systems provide time with a better precision than 1 second.

这可能解释了为什么在非常快的操作中减去低精度时间时得到 0。

我无法使此代码正常工作？这段代码应该找出程序为 find[42] 花费了多长时间这是一个 python 代码

I am having trouble getting this code to work? This code is suppoed to find out how long it took for the program for fing d[42] This is a python code

python

python-3.x

dictionary

time

zip

我无法使此代码正常工作？这段代码应该找出程序为 find[42] 花费了多长时间 这是一个 python 代码

I am having trouble getting this code to work? This code is suppoed to find out how long it took for the program for fing d[42] This is a python code

python

python-3.x

dictionary

time

zip

我无法使此代码正常工作？这段代码应该找出程序为 find[42] 花费了多长时间这是一个 python 代码