Learn python-day02-03--From Python Distributed Crawler Creating Search Engine Scrapy

Section 347, Python Distributed Crawler Build Search Engine Scrapy Essentials - Randomly Change user-agent Browser user-agent through Download Middleware Introduction to download Middleware Middleware is a framework that can be connected to request/response processing.This is a very light, low-level sys ...

Posted on Mon, 17 Feb 2020 17:14:55 -0800 by bp90210

python note 18 (review)

Today's Content Review Detailed Content 1. Getting started with Python 1.1 Setting up environment Set up python environment on mac system. The role of environment variables: to facilitate the execution of executable programs on the command line (terminal), add the directory where the executable programs are located to the environment variable ...

Posted on Fri, 14 Feb 2020 08:53:33 -0800 by vidyashankara

snmp4j introduction and Application

Introduction to SNMP SNMP refers to the Simple Network Management Protocol.It belongs to the application layer protocol of the TCP/IP five-layer protocol.It provides a simple and convenient mode to manage elements in a network.The elements here are the managed objects, either a hardware in ...

Posted on Thu, 13 Feb 2020 19:32:20 -0800 by DJH

[SpringBoot MQ Series tutorial] RabbitMq initial experience

[SpringBoot MQ Series tutorial] RabbitMq initial experience The advantage of mq in asynchronous decoupling peak cutting is very prominent. Now many projects will use it. Mastering the knowledge of mq and how to use it smoothly can be said to be a necessary professional skill point Next, we enter the learning process of rabbitmq <!-- more ...

Posted on Mon, 10 Feb 2020 05:00:51 -0800 by MaxD

ChirpStack Learning Notes 2.8 Application Integration InfluxDB

Article Directory Preface 1 Functional description measurement of upstream and downstream data Naming format for measurement s Tags for measurements measurement of other classes 2 Specific operations 2.1 Initialize and start the InfluxDB container 2.2 webui Configuration InfluxDB 2.3 Device Repo ...

Posted on Sat, 08 Feb 2020 00:22:26 -0800 by Mirge

What is the best way to remove accents from Python unicode strings?

I have a Unicode string in Python, and I want to remove all accents (diacritics). I found an elegant way to do this in Java on the Internet: Convert Unicode strings to long normalized format with separate letters and diacritics Delete all characters of Unicode type "diacritical". Do I need to install libraries like pyI ...

Posted on Thu, 23 Jan 2020 07:53:20 -0800 by Deanznet

Deploy lvs-dr + preserved cluster

LVS-DR mode DR mode - Direct Routing DR mode is short for short. It adopts semi open network structure, similar to TUN mode, but each node is not scattered around, but is located in the same physical network with the scheduler The load scheduler is connected with each node server through the local ne ...

Posted on Tue, 21 Jan 2020 09:14:23 -0800 by janey

Android Foundation: how to determine the unique identification code of Android device

This is a reprint of the article, the original link is as follows. In case of infringement, delete after contact.link The unique identification must satisfy two characteristics to solve the problem of locating the unique equipment perfectly, but the solution to this problem is doomed to be close to perf ...

Posted on Tue, 14 Jan 2020 23:08:12 -0800 by thepreacher

Join usage in MySQL

Article directory Join usage in SQL #1 environment #2 create table and insert data #3 start #3.1 inner join #3.2 left join #3.3 right join #3.4 full join Join usage in SQL #1 environment MySQL5.7 Mac #2 create table and insert data Create two new tables tableA and tableB mysql> creat ...

Posted on Sun, 12 Jan 2020 00:04:57 -0800 by AbraCadaver

How do I determine CPU and memory consumption from within a process?

I was once tasked with determining the following performance parameters from within a running application: Total Available Virtual Memory Currently used virtual memory Virtual memory currently used by my process Total available RAM RAM currently in use RAM currently used by my process Percentage of CPU curre ...

Posted on Wed, 08 Jan 2020 19:20:02 -0800 by dapuxter