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First, the difference between python2x and python3x1, python2x source clutter, high repetition rate, python3x source code beautiful concise and clear.2, python2x default use Unicode encoding, only support English numeric special characters; python3x default UTF-8 encoding, support Chinese.Second, operator1, judge the following logical statements True,false.1) 1 > 1 or 3 2) not 2 > 1 and 3 2. Find the values of the following logical statements.1), 8 or 3 and 4 or 2 and 0 or 9 and 72), 0 or 2 and

. Heap: The heap is created by the runtime and contains data that is assigned to the object at run time. Stacks: Stacks store local variables and partial run-time results, and it also facilitates method invocation and return, where each thread creates a private JVM stack when its thread is created. Program counter: This memory area contains the address of the command that the JVM is currently executing. Local method Stack: This area is the area of memory reserved for all local me

This article is written based on the Python3 crawler, the circle June just touch a day python written by the small demo.Incoming group: 125240963 to get dozens of sets of PDFs Oh!Pre-preparation python3.x (Requests,beautifulsoup,lxml) Import For leaderboard analysis, the leaderboard matches the song list.NetEase cloud Music exists an interface link to jump to the correct MP3 link Http://music.163.com/song/media/outer/url?id=##########.mp3 There is a

',Lambdaself:self.name+'SB')##设置属性Print(obj.__dict__)Print(Obj.show_name (obj)) delattr (obj,' Age')## Delete PropertiesDelattr (obj,'Show_name')## Delete PropertiesDelattr (obj,'show_name111')#does not exist, then an errorPrint(obj.__dict__)Class is also an objectclassFoo (object): Staticfield=" old boy" def __init__(self): Self.name='Wupeiqi' deffunc (self):return 'func'@staticmethod#Static Methods defBar ():return 'Bar'Print(GetAttr (Foo,'Staticfield'))Print(GetAttr (Foo,'func'))Prin

。。‘)for i in range(10): t=threading.Thread(target=run) t.setDaemon(True) #设置子线程为一个守护进程 t.start() print(‘over‘)#主线程结束后，子线程就结束了，run函数不会执行Lockimport threadingfrom threading import Locknum = 0Lock = Lock()def run(): global num lock.acquire() #加锁 num+=1 lock.release() #解锁 with lock: #自动加解锁 num+=1for i in range(100): t=threading.Thread(target=run) t.start()while threading.active_count()!=1: passprint(num)Thread poolYou can control how many threads are allowed

, and that there is no relation to a static variable of a type. Therefore, they cannot be used at the same time. Title (3) What is the output of the C + + code in operation? answer : The output N1 is a random number with a n2 of 0. In C + +, the order in which member variables are initialized is the same as the order in which they are declared in the type, regardless of their order in the constructor's initialization list. So in this problem, the N1 is initialized first, and the parameter n2 of

March 4, 201525 horse races, 5 runways, which means that 5 horses can compete at the same time. Ask the least number of races to know the 5 horses that run fastest.Divide the horse into a, B, C, D, E five groups.第1-5次 Competition: Each group to play the game, to decide the rank of each groupA1, A2, A3, A4, A5,B1, B2, B3, B4, B5,。。。。。。。。。。 E4, E5.6th races: A1, B1, C1, D1, E1,First place is the fastest runner.7th competition: Match the next dismount of the last group and the remaining 4 horses of

SOURCE 1:http://www.zhihu.com/question/27950576The basic topic probably has the following several1, using pointers, references or direct values to allocate memory, which can succeed, which will leak2. Different meanings of static in different scenes3. What is the difference between vector and list?4. What is polymorphic5. The difference between new and malloc6. Constant pointer and pointer to constant7, in situ reversal linked list8. Determine if the chain list has a ring9, inheritance, multiple

between JSP and servlet, the common denominator, and the scope of their respective applicationsAnswer: JSPs are essentially servlets, but they are not created the same way. The servlet is completely Java program code composition, good at process control and transaction processing, It is not intuitive to generate dynamic Web pages through Servlets. JSP is made up of HTML code and JSP tags, which makes it easy to write dynamic Web pages. Therefore, the servlet is used to control the business proc

overloaded overloading of a method are different manifestations of Java polymorphism. Overriding overriding is a representation of polymorphism between a parent class and a subclass, and overloading overloading is a representation of polymorphism in a class. If you define a method in a subclass that has the same name and arguments as its parent class, we say that the method is overridden (overriding). When an object of a subclass uses this method, the definition in the subclass is called, and f

happens if you compile or run the following program (radio)Session session=sessionfactory.opensession ();tx = Session.begintransaction ();Customer customer= (Customer) Session.get (Customer.class,new Long (1));Tx.commit ();Session.close ();Iterator orderiterator=customer.getorders (). Iterator ();A) Compile error B) compile pass, and normal run C) compile pass, but runtime throws exception(13) About HQL and SQL, which of the following statements is correct? (Multiple selection)A) HQL is no diff

on the Internet to see a test shell problem--the statistics of a folder size greater than 7MB the folder Okay, I'll do it. Deep, personal feel, this problem is the main test of the regular use of the Linux proficiency (I am not very familiar with, haha), the topic to statistics, mainly used to two steps: Find + count, as long as the folder is more than 7MB to find out folders, and then can count. Find out what command to use, you can use Find, find out a folder with a size larger than 7MB fold

] [zip file name] [original file] and unzip [parameter] [ZIP file name] [filename to unzip]. Parameters: The parameters of the zip:-u update file;-d delete the files in the zip package;-R contains the files in the subdirectory;-M moves the files to the package. Zip does not resemble gzip, the original file will be deleted after compression, 1 fast compression;-9 slow compression;-V shows the details of the compression process;-T toilet compression pack. Unzip parameters:-L do not press the file,

double type is wider than the long type, so you must cast it.6. What will be returned in Java 3*0.1 = = 0.3? True or False?A: false, because the floating-point number can not be completely accurate expression, generally will lose precision.7. Float F = 3.4 in Java; Is it correct?A: Incorrect, 3.4 is a double precision number, the double type (double) assignment to float (float) is a downward transformation (down-casting, also known as narrowing) will result in a loss of precision, so you need t

(Zcount >0){//q is 0 if(Zcount-1>0){return 0; }//if //q is negative if(ncount%2){return 0; }//if //q is positive Else{//To fall off the element labeled Zeroindexindex = Zeroindex; }//else}//if //P is the positive minus of the absolute minimum. Else if(ncount%2==0) {index = Pindex; }//P is negative minus the absolute minimum negative Else{index = NIndex; }//else //Maximum product

single-threaded run callback function, or a single-threaded run of the functions set by onReadyStateChange, but the synchronization task can block the JavaScript engine thread code before executing an AJAX asynchronous request. The interface has been stuck for a long time, unable to perform other operations until the synchronization task is completed, unblocked, and the interface can do other thingsReference article:Http://www.ruanyifeng.com/blog/2014/10/event-loop.htmlHttp://www.iamued.com/qia

1.public class Test {public static void main (string[] args) {User U = new User ("FFF"); Test.setusers (U); System.out.println (U.getname ());} public static void Setusers (User u) {u = null;}} public class User {private string name;public User (String name) {this.name = name;} Public String GetName () {return name;} public void SetName (String name) {this.name = name;}}It's so weird, it turned out to be FFF.2. In the update:This article is from the "Wave Plume Breeze" blog, please be sure to ke

This tutorial introduces some ideas and methods of the characters ' acne. Thinking: Acne on the face of the place is generally 1.1 points, as long as we set the size of the brush, different acne needs to choose a different size of the brush, and then in the vicinity of acne absorbing skin color, and then directly with the brush acne point off. The method is very simple and practical. Original Final effect 1. Set the "source"

If you deal with the bright spots (uneven lights or flash lights that cause a person's face to appear as if they are sweaty), you'll know that they are pretty hard to handle unless you understand the technique described below. First step: Please open the photo that needs to be decorated with bright spots. Step Two: Press S to select the Clone Stamp tool from the toolbox and, in the options bar, change the mode from normal to dimmed to

Final effect Diagram Material picture The 1th step: We will two pieces of prepared footage of the picture at the same time open in PS, as shown in the following figure; 2nd step: Use rectangular marquee tool, select the character head, execute CTRL + C, as shown in the following figure; 3rd Step: Select the Monroe layer, execute CTRL + V, as shown in the following figure; 4th step: Select layer one, reduce opacity to 50