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  Install Python Because I installed centos7, I don't need to install python2.7. Just follow the steps below. yum install zlib zlib-devel readline-devel sqlite-devel bzip2-devel openssl-devel gdbm-devel libdbi-devel ncurses-libs kernel-devel libxslt-devel libffi-devel python-devel zlib-devel sshpass gcc git -y mv /usr/bin/ ...

brief introduction python deployment has always been a problem, but now it's 2018, and there are many mature solutions. The most commonly used is nginx + upervisor + virtualenv + gunicorn / uwsgi. The advantage is that it is very convenient to control program start / stop / restart, especially when you have many services; but abusi ...

Celery introduction Cellery is a simple, flexible and reliable distributed system dealing with a large number of messages, and provides the necessary tools to maintain such a system. It is a task queue that focuses on real-time processing and supports task scheduling. What is task queue Task queue: a mechanism to distribute tasks between thread ...

Performance optimization principle: When we want to return a page to client browser, we need to query data in database and render the data and basic page template to form a page to return to the client. But if every user visits the home page once, it will undoubtedly bring great performance problems to database query when the amount of visits ...

I. Write in front In Last blog As mentioned in the article, Celery can be used to speed up the crawling of web crawlers, which contains a large number of network requests. So, this blog will specifically talk about how to use Celery to speed up our crawlers!   II. Knowledge Supplement 1.class celery.group The group class represents the cre ...

Introduction of pandas Python Data Analysis Library or pandas is a tool based on NumPy, which is created to solve data analysis tasks. Pandas incorporates a large number of libraries and some standard data models, providing the tools needed to operate large data sets efficiently. Pandas provides a large number of functions and methods that enab ...

Single row layout is in the middle The most common form of page layout in the middle of the horizontal level is the title and the organization of the content area. Here are four ways to achieve the middle of the horizontal level (note: the alignment of child elements is implemented in the following examples, and the parent container of child e ...

Environmental preparation python3.5.4 windows redis pip install celery pip install redis Start redirs server under windows redis-server.exe redis.windows.conf image.png celery configuration Project settings.py file modification: # celery settings # celery intermediary redis://redis service ip address: port/database num ...

First of all, you know that Django is a synchronization framework. In order to speed up user response time and improve user experience. So I decided to use asynchronous tasks to perform some tasks in the background. In addition to asynchronous tasks, celery can also start timing tasks to facilitate scheduling. Packages to be ins ...

Preface This paper mainly introduces the common traversal methods of arrays: forEvery, map, filter, find, every, some, reduce. They have one thing in common: they do not change the original array. 1. forEach: Traversing arrays var colors = ["red","blue","green"]; // ES5 traversal array method for(var i = 0; i < colors.length; i++){ consol ...