365热榜

阿里云centos环境下python中selenium长时间运行报错

问题遇到的现象和发生背景 阿里云服务器2g内存,1核的 centos系统使用无界面化后台启动py程序,使用chromedriver,代码运行第一天一切正常,第二天开始报错,显示报错有以下几种 1、unknown error: DevToolsActivePort file doesn't exist 2、Can not connect to the Service chromedriver 3、timeout: Timed out receiving message from renderer...

2022-05-16 | CSDN问答 | 518浏览

python基础知识合集

python 基础部分 字符串 find:从左往右,只要遇到一个符合的就返回位置,如果没有找到合适的就返回 1 rfind:从右往左找 index:也是查找,但是找不到会报错,所以一般用find count:用于计数 src.count '.' 查找.的个数 判断: startwith,endwith,isalpha,isdigit,isalnum,isspace 返回的都是布尔值 字母数字组合 filename = '' s = 'qqwertyuiopasdfghjklzxcvbnmQWE...

2022-05-16 | 七月2333 | 691浏览

【Python3.10文档--教程】2.0Python解释器

Python解释器 2.1调用解释器 21 2 2.1.1启动解释器的四种方式 211 3 2.1.2交互模式 212 19 2.2解释器的运行环境 22 27 2.2.1源文件的字符编码 221 28 解释器可以以交互式快速的进行代码的执行和调用 2.1调用解释器 2.1.1启动解释器的四种方式 1、 cmd 、 win+r 打开命令行,启用 python.exe 进入交互模式。 退出交互模式的三种方式: 1 quit 2 exit 3 ctrl+Z https://img blog.csd...

2022-05-16 | 会振刀的程序员 | 946浏览

【django后台】浏览器同源策略和CORS跨域(1)

一、浏览器的同源策略 同源策略是浏览器的⼀个安全功能,不同源的客户端脚本 js⽂件 在没有明确授权的情况下,不能读写对⽅资源。只有同⼀个源的脚本赋予dom、读写cookie、session、ajax等操作的权限。 url由协议、域名、端⼝和路径组成,如果两个url的协议、域名和端⼝相同,则这两个url是同源的。 举例来说: 协议是 http:// 域名是 www.example.com 端⼝是 80(默认端⼝可以省略) https://img blog.csdnimg.cn/ed3aa38...

2022-05-16 | YZL40514131 | 403浏览

三年程序员...给想学python编程的一些建议...

自打我入行以来,有非常多朋友们问我,Python怎么学?爬虫怎么学?想学习web开发能教教我吗?学了一段时间还是不入流?学习很久,但还是感觉好多的东西都不会? 会产生这些问题的主要原因是没有一个完整的知识体系,你不知道自己现在的进度、未来的方向。所以这几天我抽时间去做了Python学习规划,附带我个人的经验,一起分享给大家。 一、确定学习目标 Python爬虫 这也是Python的必修课之一,而且用爬虫在网上抓取数据赚钱还是很方便的,比如帮证券大佬抓取财经新闻,帮粉丝整理爱豆在不同平台发布的视频...

2022-05-16 | 程序员_宇宁 | 768浏览

听说你想学Python爬虫?我从零教你啊

*️ 爬虫相关技术 如果你希望学习爬虫,并且想要学好爬虫,那在学之前,先要了解一下爬虫入门阶段需要准备好哪些知识点,这样才能高效入门,否则门口晃悠的时间就太长了。 以下内容是初学爬虫前 2 周,必须要掌握的知识点,Python 语言知识除外。  HTTP 通讯协议 只要你使用过浏览器访问网站,那必然知道网址的大概形式,例如  ,现在更多的站点都切换为  https  协议,但是不管如何变,协议的基本逻辑是一致的。 HTTP(HyperText Transfer Protocol)是一种在服...

2022-05-16 | InfoQ | 338浏览

用Python绘制超酷的gif动图,惊艳了所有人

87fb31f7862b3ca85849978946752d46.png https://img blog.csdnimg.cn/img convert/87fb31f7862b3ca85849978946752d46.png 在之前的一篇文章当中,小编当时分享了如何用 Python 当中的 gif 模块来制作 gif 格式的图表, 厉害了,用Python绘制动态可视化图表,并保存成gif格式 今天小编再给大家来介绍一种制作 gif 格式图表的新方法,调用的是 matplotlib 的相关模块...

2022-05-16 | 菜鸟学Python | 748浏览

Python的高级文件操作

Python的高级文件操作 一、前言 4 二、删除文件 18 三、重命名文件和目录 57 四、获取文件基本信息 106 一、前言 Python内置的os模块除了可以目录进行操作,还可以对文件进行一些高级操作,具体操作如下表: 函数 说明 access path,accessmode 获取对文件是否有指定的访问权 读取/写入/执行权限 。accessmode的值是R OK(读取)、W OK(写入)或F OK(存在)。如果有指定的权限,则返回1,否则返回0 chmod path,mode 修改pa...

2022-05-16 | ζ小菜鸡 | 270浏览

AttributeError: module ‘django.db.models‘ has no attribute ‘FieldDoesNotExist‘

https://img blog.csdnimg.cn/daa72c98badf44c9ad3b0fcf07ed65a7.png 解决方法: from django.core import exceptions 并修改如图所示部分内容 https://img blog.csdnimg.cn/ef141371240b4ae6870ca139bd850dac.png

2022-05-16 | xutengfei999 | 738浏览

django配置存储上传文件根目录并使用xadmin添加本地图片

1.在yd api/settings/dev.py文件中添加配置 import os,sys BASE DIR = os.path.dirname os.path.dirname os.path.abspath file / 项目中存储上传文件的根目录 暂时配置 ,注意,uploads目录需要手动创建否则上传文件时报错  MEDIA ROOT=os.path.join BASE DIR,'uploads'   / 访问上传文件的url地址前缀  MEDIA URL ='/media/' 2.yd...

2022-05-16 | xutengfei999 | 309浏览

Python crawler XPath list is empty

use python Climb to the details page of the house world , But only property categories can climb out , Others are empty img https://img mid.csdnimg.cn/release/static/image/mid/ask/461482996646168.jpeg?x oss process=image/auto orient,1/resize,w 320,...

2022-05-16 | CSDN Q & A | 218浏览

What is a python module?

Python modular Module What is it? ? Take the answer 1: Python modular Module , It's a Python file , With .py ending , Contains Python Object definition and Python sentence . Modules allow you to organize your Python Code segment . Ass...

2022-05-16 | Alibaba cloud Q & A | 929浏览

What are packages in Python?

Python What is the bag in ? Take the answer 1: A package is a hierarchical file directory structure , It defines a package consisting of modules and subpackages , And subpackages under subpackages, etc Python Application environment . Simply spe...

2022-05-16 | Alibaba cloud Q & A | 934浏览

Collection of Python basic knowledge

python Base part character string find: From left to right , Return to the location as soon as you encounter a matching , If you don't find the right one, go back 1 rfind: Look from right to left index: It's also looking for , But I can't find...

2022-05-16 | July 2333 | 183浏览

[Django background] browser homology strategy and CORS cross domain (1)

One 、 The same source strategy for browsers The homology strategy is the of the browser ⼀ A security function , Client scripts from different sources js⽂ Pieces of Without explicit authorization , Can't read or write right ⽅ resources . Only t...

2022-05-16 | YZL40514131 | 996浏览

[Python 3.10 documentation -- tutorial] 2.0 Python interpreter

Python Interpreter 2.1 Call interpreter 21 2 2.1.1 Four ways to start the interpreter 211 3 2.1.2 Interactive mode 212 19 2.2 The operating environment of the interpreter 22 27 2.2.1 Character encoding of the source file 221 28 The interprete...

2022-05-16 | A programmer who can vibrate a knife | 244浏览

I heard you want to learn Python crawler? I'll teach you from scratch

*️  Reptile related technology If you want to learn about reptiles , And want to learn reptiles well , That's before school , First of all, we need to know what knowledge points we need to prepare for the introduction stage of crawler , In order t...

2022-05-16 | InfoQ | 698浏览

Three years of programmer Some suggestions for learning Python Programming

Since I joined the industry , Many friends asked me ,Python How to learn ? How do reptiles learn ? Want to learn web Can development teach me ? After learning for some time, I still don't enter the stream ? Study for a long time , But I still feel t...

2022-05-16 | Programmer_ Yu Ning | 713浏览

Using Python to draw super cool GIF moving pictures has amazed everyone

87fb31f7862b3ca85849978946752d46.png https://img blog.csdnimg.cn/img convert/87fb31f7862b3ca85849978946752d46.png In a previous article , Xiaobian shared how to use Python In the middle of gif Module to make gif Format chart , much , use Pyt...

2022-05-16 | Novice learning Python | 486浏览

Django configuration stores the root directory of uploaded files and uses xadmin to add local images

1. stay yd api/settings/dev.py Add the configuration to the file import os,sys BASE DIR = os.path.dirname os.path.dirname os.path.abspath file / The root directory where the uploaded files are stored in the project Temporary configuration , Be c...

2022-05-16 | xutengfei999 | 505浏览