How to compare two lists in python
Through continuous testing, we found that python can efficiently and quickly compare the differences between two lists. It can operate with the help of the set operation provided by python set(). This method is very efficient.
In the Java language, method 1 of the following methods is more efficient and faster than method 2 (set operation). This can be regarded as a little difference between the similarities between the two languages.
The code is as follows:
#-*- coding:utf-8 -*- import time #方法1: def getDiff1(arr1,arr2): start_time = time.time() print('1_start:',start_time) arr_more1 = [] arr_more2 = [] dic_result = {} for str_1 in arr1: dic_result[str(str_1)] = 1 for str_2 in arr2: if dic_result.get(str(str_2)): dic_result[str(str_2)] = 2 else: arr_more2.append(str_2) for key,val in dic_result.items(): if val == 1: arr_more1.append(key) print('arr1比arr2多的内容为:',len(arr_more1)) print('arr2比arr1多的内容为:',len(arr_more2)) end_time = time.time() print('1_end:',end_time) print('方法1_比对用时为',end_time-start_time) #方法2:使用集合运算: def getDiff2(arr1,arr2): start_time = time.time() print('2_start:',start_time) set_1 = () set_2 = () #将列表转换为集合set() set_1 = set(arr1) set_2 = set(arr2) set_more1 = () set_more2 = () #集合运算 set_1_2 = set_1 & set_2 set_more1 = set_1 -set_1_2 set_more2 = set_2 -set_1_2 print('arr1比arr2多的内容为:',len(set_more1)) print('arr2比arr1多的内容为:',len(set_more2)) end_time = time.time() print('2_end:',end_time) print('方法2_比对用时为',end_time-start_time) #测试 # 初始化500w条数据数据 arr1 = [] arr2 = [] i = 0 while(True): arr1.append(i * 2) arr2.append(i * 3) i += 1 if i > 5000000: break print('arr1的长度为:',len(arr1)) print('arr2的长度为:',len(arr2)) print('+'*30) getDiff1(arr1,arr2) print('-'*30) getDiff2(arr1,arr2)
Running results:
Learn in the Python tutorial column!
The above is the detailed content of How to compare two lists in python. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

Solution to permission issues when viewing Python version in Linux terminal When you try to view Python version in Linux terminal, enter python...

How to avoid being detected when using FiddlerEverywhere for man-in-the-middle readings When you use FiddlerEverywhere...

How to teach computer novice programming basics within 10 hours? If you only have 10 hours to teach computer novice some programming knowledge, what would you choose to teach...

When using Python's pandas library, how to copy whole columns between two DataFrames with different structures is a common problem. Suppose we have two Dats...

How does Uvicorn continuously listen for HTTP requests? Uvicorn is a lightweight web server based on ASGI. One of its core functions is to listen for HTTP requests and proceed...

Fastapi ...

Using python in Linux terminal...

Understanding the anti-crawling strategy of Investing.com Many people often try to crawl news data from Investing.com (https://cn.investing.com/news/latest-news)...
