common knowledge book

This article mainly introduces a summary of common Python knowledge points, including Set Sets, Functions, deep copy, and shallow copy. For more information, see 1. Set basic data type A. set is an unordered and non-repeating element set. Class set (object): "set ()-> new empty set object set (iterable)-> new set object Build an unordered collection of unique elements. "def add (self, * args, ** kwargs):

Some common knowledge of databases are important operation statements. Some common knowledge of databases are important operation statements. Drop view -- delete a VIEW from a database Create index -- CREATE an INDEX for the database table Drop index -- delete an INDEX from a database Create procedure -- CREATE a stor

I. Knowledge of scripting language1. Common scripting languages are: Html,css,js,asp,python, etc.2. Scripting language Features:A. Grammar and institutions are usually relatively simpleB. Learning and use are usually relatively simplec. Generally, the "interpretation" of the program is easy to modify as a way of running, without the need to "compile"D. Program development capacity is superior to operational

Basic knowledge and common configuration of TomcatTomcat consists of:Tomcat itself consists of a series of configurable components, the core component of which is the Servelt container component, which is the top-level container for all other Tomcat components.Each component can be configured in the Tomcat installation directory/conf/server.xml file, and each Tomcat component corresponds to a configuration

the last two or three weeks accumulated some common knowledge points, mainly used in common work, share. Postgre Database Import and Export 1. First configure the bin path of the Postgre to the path by using the environment variable2.pg_dump-u Postgres starxxxx > Starxxxx.sql3.psql-u Postgres Starxxxx A simple import and export o

Linux common knowledge and fault handling 1, modify the current system language For example, the current language is en_US. UTF-8, because the environment needs to be modified to ZH_CN. UTF-8, first switch to root, append a line of content. echo ‘export LANG="zh_CN.UTF-8"‘ >> ~/.bashrc Re-login to view language changes echo $LANG2, the Linux system in the root directory or the ne

humans enter the information society, how to protect computers, networks, and data is a matter of great concern. The design, monitoring, and improvement of power quality is not only a matter of quality, but a matter of security. The normal operation of the uninterrupted power supply society is a new topic. Generally, simple user solutions can improve the power supply quality of information equipment through AC voltage regulators, anti-interference filters, and uninterruptible power supplies. At

Linux Learning CentOS (ii)--some common commands for the initial knowledge of LinuxAfter installing CentOS6.4 on the VM, looking at the Linux system to run successfully, the heart small excited a ... But the road ahead of learning is still far away ...The first time you learn a Linux system, you have to start with some basic Linux commands.Linux commands are commands for managing a Linux system. For Linux s

public static fields and public common fields can be accessed - defShow (self): - Print(c.name) - #print (C.__na) does not have normal access + Print(Self.foo) - #print (Self.__fox) does not have normal access to private fields + Print("class Access:", C.name)#class Access A #Print ("Class access private field:", C.__na) #报错, cannot access atObj2=C () -Obj2.func ()#all can be accessed normally, print four - - -Ob

-reading indicators are reading text, ntext, image, or 2D (varchar (max), nvarchar (max) and varbinary (max.Logical reading, physical reading, and pre-reading are the reads of common data pages. Use SQL Server Management studio standard reports In SQL Server Management studio, when selecting a database server, a specific database, or security-logins, or management, the notification services or SQL Server Agent object, SQL Server provides some ready-ma

Server maintenance knowledge 1. boot sequence Generally, the system should strictly follow the steps below: Turn on the total power supply. Power on the computer Cabinet Power on external devices (such as disk arrays and tape libraries) After the external device self-check is complete, the host is powered on. Server maintenance knowledge 2. shutdown sequence Shut down the Operating System (shutdown-h-y 0) P

Phper's common noodle questions for the great gods. How to design the sub-database table How do I handle a MySQL deadlock? Talk about your understanding of closures. PHP Memory Recovery mechanism How to troubleshoot PHP memory overflow issues Methods of database Optimization Brief introduction of operation Principle of Laravel Laravel Routing Implementation principle Cookie and session difference, where is the

Shell common knowledge-general Linux technology-Linux programming and kernel information. The following is a detailed description. Shell common knowledge 1. system environment variables after users log on to the system $ HOME user's own directory $ PATH: the directory to be searched during Command Execution $ TZ Time Z

I sorted out the common knowledge of some PHP classes to make it easier for new users to master the PHP classes, so that they can quickly understand the programs written by those elders, I hope you can add or correct the errors. Q: Can classes in PHP have constructors? A: Yes, as long as the function name and class name are the same SyntaxHighlighter. all (); I sorted out the