ccent study

Phython Study Notes-a preliminary understanding of the class, phython Study Notes Class is the core of object-oriented programming. It plays the role of relevant data and logical containers. They provide blueprints for creating instance objects. The python language does not require Object-Oriented Programming (different from JAVA). Here is a simple example. How to define a class class Classname(base_class[e

Python self-study notes (1) A simple understanding of python, a self-study note to understand python Internal Mechanism of script interpreted language Python first compiles the script into a bytecode file (pyc, pyo) The python Virtual Machine interprets and runs the bytecode File Internal mechanisms of compiled languages Compile the source code into machine code (code that can be understood by the machine)

Chenxi's html Study Notes and chenxi Study Notes 1. browser kernel:1. ie: trident Kernel2. firefox: gecko (gecko) Kernel3. safari: webkit (Browser core) Kernel4. opera: It used to be the presto (Rapid) kernel. Now it is switched to Google's blink (flickering) kernel.5. Chorme: blink (developed jointly by Google and opera software Based on webkit) (Appendix: What is the understanding of the browser kernel ?)

[Study Notes] the inclusion of the [C Language] file and the C language of study notes I. Basic Concepts # Include, which can copy all the content of one file to another. II. General Form 1. 1st forms # include Go to the directory where the function header file of the C language library is located to find the file.2. 2nd forms # include "file name"The system first searches for the source code in the current

CSS3 Study Notes (5)-page mask effect, css3 Study Notes Today, I will release the page mask effect. Previously, the masks were implemented in JS. Suddenly, I found that the box-shadow attribute in CSS3 is not only used for stereoscopic shadow, you can also mask pages ~~~~ The following describes the dynamic results: It can be seen that when the mouse is hovering over the button, the mask of the entire page

Original article, reproduced please indicate the source: http://blog.csdn.net/crzy_sparrow/article/details/7392345 I am very good at it. There must be a lot of mistakes. I hope you will not correct them. After reading the Harris corner detection, I started to study the surf corner detection and found that it was quite complicated. At the moment, I only learned about it and summarized what I learned so that I could

-their corresponding bundle files 6-1 Rewrite our webpack.config.js file: var path = require (' path ' = {entry:{ab: './component/ab.js ' }, output:{filename: ' [name ]-[hash].js ' ' Dist ' new htmlwebpackplugin ({ FileName: ' ab.html ', Template: './component/index.html ', chunks:[' AB '}), new Htmlwebpackplugin ({ FileName: ' cd.html ', Template: './component/index.html ', chunks:[' CD ' 6-2 after packaging generated dist/ab.html and dist/cd.html in Dist, the browser ope

(Style={styles.container}initialroute={{Component:list,Title: ' Cruise ship ',passprops:{},}}/>);}}Const STYLES = Stylesheet.create ({Container: {Flex:1,},});Appregistry.registercomponent (' Navbartest ', () = Navbartest);The above is to create a navigatorios, then the default list is the main page. When jumping to another detail interface, you only need to define an action, and then add the function to implement it. Here is the instance code:Import React, {Component} from ' React ';Import {App

", "CompressionLevel": 9} #生成对象并填写类似于字典的key和valueconfig ["bitbucket.org"] = {} #先生成对象config ["bitbucket.org"] [User] ] = "HG" #再填写keyconfig ["topsecret.server.com"] ={}topsecrect = config["topsecret.server.com"]topsecrect["Host Port"] = "50022" topsecrect["ForwardX11"] = "no" config["DEFAULT" ["ForwardX11"] = "yes" with open ("Exzample.ini", "W") as Configfile:config. Write (ConfigFile) will generate the following INI configuration file [default]compression = Yescompressionlevel = 9serveralivein

1. Open FileUse Handle=open (Filename,mode) to open the file. This function will return a handle (which should be translated as "handle") to manipulate the file, and the parameter filename is a string. The parameter mode is optional, ' R ' stands for reading the file, ' W ' represents the Write file.Cases:>>> Fhand=open ('mbox.txt','r')>>> Print (Fhand)The file handle can be thought of as a sequence of strings, and each line of an instance of the document is the contents of the string sequence.E

corresponding pattern in the right parenthesis to match the content, meaning that the previous occurrence, in \1 this also appears once\2...\ (A.B) xy\1:a6bxya6b2. Extended Regular Expressions　　　　Egrep: Use an extended regular expression to build the pattern, which is equivalent to GREP-EMetacharactersCharacter Matching:.: Any single character[]: Any single character within the specified range[^]: Any single character outside the specified rangeNumber of matches:*: The character in front of the

device, hangs under this file.　　/mnt: mount points, such as additional storage devices, new hard drives.　　/misc: Miscellaneous for inconvenience classification.　　　/opt: Optional directory, alternate directory, earlier used to install third-party programs.　　/proc: Pseudo file system, built-in state parameters, configuration parameters, mapped to some files, the content of the file is the value of the parameter variable.　　 　/sys: Pseudo file system, hardware working state parameters, configuratio

content to seeTry using the Get/index http/1.0 command:4 Start the Connectionwatcher, and then start a number of Internet-enabled programs (such as QQ, Telnet, browser, etc.), to see what the computer on the Internet, what port is used? What ports does QQ use to interact with those remote IPs, where are these IPs distributed? What protocols are used for communication?QQ uses 80 port, ip:183.232.103.219, Shenzhen city, Guangdong province360 browser is using 80 port, ip:180.163.251.158, Shanghai,

not allow null values, there is no default clause, which affects MySQL's handling of columns:1.如果没有启用SQL的严格模式，这列将会被设置成其数据类型的隐含默认值。2.启用SQL严格模式之后，如果表是事务性的，就会出现错误。这条语句会中止执行，然后回滚。对于非事务性的表，如果这行是该语句插入的第一个行，那么会出现一个错误，该语句中止执行，如果不是第一行，那么可以选择中止执行，或选择把这列设置为它的隐含默认值，同时发出一条警告信息The implied default value of a column depends on its data type.1.对于数字列（不包含那些具有auto_increment属性的列），其默认值为0. 对于auto_increment列，默认值是下一个列的列序号。2.对于大多数时态类型列，其默认值为该类型的“零”值 对于enum列，默认值为枚举集里的第一个元素， 对于set列，如果不允许NULL值，默认值将是一个空集不过它等价于空串。

Preliminary Study on WCF-20: WCF error protocol, Preliminary Study on wcf-20 ProtocolWCFError agreements Overview In all hosted applications, error handling is represented by an Exception object. In SOAP-based applications (such as WCF applications), service methods use SOAP error messages to transmit and process error messages. A soap error is a message type included in the service operation metadata. T

Python string formatting study notes, python Study Notes In python, the % operator is used to format the output string. The common format is • Mark the string % value group to be output in the formatThe "format mark string" on the Left can be exactly the same as that in c. If there are two or more values in the 'value Group' on the right, they must be enclosed in parentheses and separated by short signs. Fo

Java gui programming Overview Study Notes (22), gui Study Notes The following content is my study notes on the java video tutorial of Miss Bi Xiangdong! Java gui programming:Windows provides two methods:1. GUI2. CLI;GUI: Grahi User Interface, graphical User Interface.Features: displays the computer operation interface in graphical mode, which is more convenien

Mysql Study Notes (1), mysql Study Notes I have recently encountered some problems in learning MySQL databases, some of which have been solved, and some have not yet found the answer. This article will be used as a study note, and some of the unsolved questions will be supplemented with answers later, please give me some advice when you pass; Problem 1: the Java

1. Summary of this week's study 1.1 Object-oriented learning to be over, use mind map to draw a mind map with encapsulation, inheritance, polymorphism as the core concept, and summarize the object-oriented thought.Note 1: Keywords and content do not ask for much, but the relationship between the concept of clear, content coverage to the core content of the object can be.NOTE 2: Less color, not complicated wiring, when necessary to be on the l

Yii2 in-depth study--inheritance relationship, Yii2 deep learning-- If you want to understand Yii2, be sure to understand the inheritance relationship of YII2 to related classes. Due to the limited amount of code that is temporarily read, only a partial inheritance is listed in the following figure, and then the source reads more and more and then increases You can see that most of the classes in Yii2 inherit from Yii\base\object, which implements t