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A reference to a (Python) object

Compare the following two examples:Example 1:A=10b=aa=a+2print "A=", A, "b=", bResults: a= b= 10After a+2, B is still 10Example 2:Aa=[1,2,4]bb=aaaa.append (3) print "aa=", AA, "bb=", BB  Results: aa= [1, 2, 4, 3] bb= [1, 2, 4, 3]AA

Java object reference transfer and value transfer Summary

The parameter passing process of objects in Java is indeed a bit messy. Here we will summarize: first, a piece of test code. Public class main {Public Class AA {Public String I;Public Int J;}Public static void main (string ARGs []) {// System. Out. Print ("dddaaass ");Main main = new main ();Main. Test ();}Public void test (){Aa a = new AA ();A. I = "";// Pass r

Lock on routine maintenance commands

-- Precautions for locking the impact of routine maintenance commands on Performance -- 1. Create index is a four-level lock SQL> Create index index_contact_name on t_to_order_info (contact_name) SQL> select * from V $ lock where type = 'Tm 'ADDR kaddr Sid type id1 Id2 lmode request ctime block?d941fab0 then 1_d941fad8 114 TM 112775 0 0 4 0 11 then 1_1_d941fbd8 114 TM 18 0 0 3 0 11 0sql> select AA. object_name, AA

Annotation framework --- AndroidAnnotations

Annotation framework --- AndroidAnnotations AndroidAnnotations is an open-source framework designed to accelerate Android development efficiency. By using its open annotation api, you can use it almost anywhere, greatly reducing the amount of irrelevant code and allowing developers to leave it out, have enough time to focus on the real business logic. By keeping your code concise, it also improves code stability and later maintenance costs.The following AndroidAnnotations are abbreviated as

Testing records of the Yingdong linear absolute value encoder (grating ruler ),

Testing records of the Yingdong linear absolute value encoder (grating ruler ), This profit-driven linear absolute value encoder model: CAPLIN-A-485 The appearance of the grating ruler is as follows. When working, the signal terminal and grating are fixed, and the slide head is driven by a motor. The encoder data is actively throttled by 485 ports. The IPC can read the data at an appropriate time. The communication format of this product is as follows: The default baud rate is 9600. The star

Class loading order for Java

Class loading order for JavaFirst, load order1. Initialization of the static member variable of the parent class1.1. Static code block1.2, ordinary code block1.3, no parameter constructor2. Static code block for parent class3. Initialization of a static member variable of a subclass  3.1. Static code block  3.2, ordinary code block3.3, no parameter constructor4. Static code blocks for subclasses5. The normal member variable of the parent class is initialized5.1. Static code block5.2, ordinary co

Take the URL of the current address bar and the parameters in the URL

See this section of code:Exports.showlogin = function (req, res) {Req.session._loginreferer = Req.headers.referer;Res.render (' Sign/signin ');};Referer is a URL reference to a previous site that jumps to your siteIn PHP, you can get the value of the parameter in the URL by post or get, recently contacted node so what is done in Nodejs, on the code!The module HTTP URL that needs to be usedCurrent URL http://localhost:8888/select?aa=001bb=002var http =

The difference between a Linux soft link and a hard link

you delete a file with a corresponding hard link, the file will remain until all references to it are deleted.Another kind of link is called symbolic link (symbolic link), also called soft link. A soft-link file has a shortcut similar to Windows. It's actually a special file. In a soft link, the file is actually a text file, which contains the location of another file, if you delete the soft link file, it is no need for this link, and the original existing entity original file does not have any

JS keyword Spherical rotation effect of the example code _javascript tips

Sometimes the internet to look up information, see other People's blog has the effect of the rotation of the key words, feel pretty good. So the Internet search for its implementation, well, write their own hands. Html: Copy Code code as follows: Css: Copy Code code as follows: #div1 {height:400px;width:450px; position:relative; margin:10px Auto;} #div1 a{position:absolute;top:0px;left:0px;font-weight:bold;padding:3px 6px; color:black; text-decoration:none;} #

Nodejs getting the current URL and url parameter values

Module HTTP that needs to be usedUrlCurrent URLhttp://localhost:8888/select?aa=001bb=002var http =Require (' http ');var url = require (' URL ');Http.createserver (function (req, res) {var arg = Url.parse (req.url). query;Method one arg = aa=001bb=002var arg = Url.parse (Req.url, true). Query;Method two arg = = {aa: ' 001 ', BB: ' 002 '}Console.log (ARG.AA);//Ret

"Java algorithm problem" professional robbery

Topic/* You is a professional robber planning to rob houses along a street. * Each house have a certain amount of money stashed, * the only constraint stopping all from robbing each of the them are th At * Adjacent houses has security system connected and * It would automatically contact the police if both adjacent Houses were broken into on the same night. * Given a list of non-negative integers representing the amount of money in each house, * Determine the maximum amount of Money you ca

[Entlib] Microsoft Enterprise Library 5.0 learning path-Step 9, using policyinjection module for AOP-PART1-basic usage Introduction

next article. 3. member name matching rule -- name verification rules This verification rule is also relatively simple. It verifies the class or class members that match the configuration name. This verification rule only receives one parameter: Member names (wildcard characters supported) See the followingCodeTo implement the AOP policy when executing the test method, I only need to inherit the class from the marshalbyrefobject, and then configure it in the Enterprise Library Configura

The basic particle swarm optimization algorithm is used to solve 2D variables.

) + rate;EndEnd% Save D values and save the I-th local optimal solution of the nth IterationXx_x (:, 1) = x_x (I, 1 );Xx_x (:, 2) = x_x (J, 2 );If (fx1tox2 (xx_x)> pbest (t, I ))Pbest (t, I) = fx1tox2 (xx_x );X_pbest (t, I, :) = xx_x;EndEnd% Save the global optimal solutionIf (pbest (t, I)> gbest)Gbest = pbest (t, I );X_gbest = x_pbest (t, I ,:);EndEndEnd% Draw_gbest is used to plot the global optimal solution.Draw_gbest = max (pbest ');Mindle = draw_gbest (1 );For t = 1: maxdtIf (draw_gbest (t)

[VC ++] Implementation of point-to-point (P2P) multi-thread resumable Data Transfer

error \ n ";Afxgetmainwnd ()-> sendmessagetodescendants (wm_age1, (lparam) AAA. getbuffer (0), 1 );AAA. releasebuffer ();Return 0;}// Enter the loop and receive the incoming socketWhile (1 ){// Create a socket for the clientSocket S1;S1 = accept (pthis, null, null );// Send a message to the main function.Cstring AA;AA = "one person join! \ N ";Afxgetmainwnd ()-> sendmessagetodescendants (wm_age1, (lparam)

JSON (2)

// Case 1: Convert Java to a JSON string @ Test Public voidFromobject (){ // Convert a Java object to a JSON string Teacher =NewTeacher (); Teacher. setname ("AA "); Teacher. setsex ("male "); Teacher. setage (28 ); Teacher. setbirth (NewDate ()); // JSON string // {Name: "AA", sex: "male", age: "28", birth :"...."} // You need to introduce the class library file System.Out. Println (jsonobject.Fromobject(

Linux Command summary: SED

\) able/\1rs loveable is replaced with lovers Save Search characters to replace other characters, such as s/love/****/love this into **love**\\> matches the end of a word, such as/love\>/matches a line containing a word ending in loveX\{m\} repeats characters x,m times, such as/0{5\}/matches a row containing 5 0X\{m,\} repeat character x, at least m times, such as/0\{5,\}/matches at least 5 rows of 0X\{m,n\} repeats the character x, at least m times, not more than n times, such as/0\{5,10\}/matc

Nodejs getting the current URL and url parameter values

In PHP, you can use post or Get gets to the parameter value in the URL, recently contacted node so what is done in the Nodejs, on the code!The module HTTP URL that needs to be usedCurrent URL http://localhost:8888/select?aa=001bb=002var http = require (' http ');var url = require (' URL ');Http.createserver (function (req, res) {var arg = Url.parse (req.url). query; Method one arg = aa=001bb=002var arg = Ur

Java read-Write properties configuration file method

1. Properties ClassThe Properties class represents a persistent set of attributes. Properties can be saved in a stream or loaded from a stream, and key and value in the attribute list must be strings. Although the properties class inherits java.util.Hashtable, you can use methods such as the put of Hashtable, but these methods allow data that is not of type string to result in unsafe behavior, so you should still use the setProperty method.2. Main methodsLoad (InputStream in) reads the list of p

Summary of Common Linux commands

Permissions: All UsersFunction Description: Modify Permissionschmod u+x aa aa file owner plus execute permissionchmod u-x aa aa files minus Execute permissionchmod g+w,o+w aa AA file for group and other persons plus write permiss

Webpack Best Practice Series (09)

: ' js/app.js ', },devserver: { open: True, publicpath: '/aa ' }, other configuration omitted ...  Like the above configuration, when the server starts, if you want to access the in-memory app.js, you need to pass Http://localhost:8080/aa/js/app.jsBack to the beginning of the problem, NPM start starts the server and cannot access the packaged index.html? Let's find out the specific r

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