chatbot learns

, the right information is correct, the wrong information, the more worry ╰ (￣▽￣) ╭The above two methods are recommended, in fact, there are two methods with the above two methods are the same effect, a bit verbose, know on the line:Command > File 2>1 Save the correct output and error output to the same file in a covered manner. function is completely equal to >.Command >> file2>1 in an additional way ... Functionally identical to >>Note: No matter which error output command, it is necessary to

One: How to ask questions1. Try to solve yourselfHelp documentationExample2. Requests for questionsQuestions to be detailed (can be understood by others, a knowledge point)Error message ()　Two: 1. Linux Case sensitive2. All content is saved as a file, including hardware (all documents)3.Linux does not have the concept of file extension, do not rely on the extension to distinguish between file types, test permissions to distinguishGeneral extension: (Agreed, for identification)Compressed package:

See the study JS, sometimes according to their own ideas, there will be some inexplicable wonderful mistakes, and these problems Baidu to, but because the basis of learning reasons do not catch, led to see the answer, but think this is not the answer1. A very simple HTML, a JS file I want in the JS button click in the p to display the time I put the reference script in the front of the results error:uncaught typeerror:cannot Set Property ' Onch Ange ' of NULL. The answer is this: Make sure the D

mold. Then their correspondence is that Beanfactory is the machine that makes the ball mold, the ball mold is the bean, and the ball is the example of the bean. And where are some of the extension points that were mentioned earlier? Beanfactorypostprocessor corresponds to when the mold is created, you will have the opportunity to make a correction to it, that is, he can help you modify the ball mold. While Initializingbean and Disposablebean are at the beginning and end of the ball-making ball,

{returnNumber Ten}var Numbers= [ -, +,7, A]hasanymatches (Numbers, Lessthanten)Closed PackageEssentially, a function is a special closure, and Swift can declare anonymous closures with {}:Numbers.map ({ in 3 * number return Result })If a type of closure is known, such as a callback function, you can ignore the type and return value of the parameter. A single statement closure will return the value of its statement as a result.inch 3 * number})You can refer to parameters by param

call is ignored. 6. SupplementInitialize :init keyword, same as OC. But this piece is very much like CPP, like this.class nyan{ 1024x768 init () { 1; } } class Miao:nyan { 1Override init () { 2 } = Miao () If you look at OC, it should output 1024, 2. Because OC does not have a call super, it is covered out.But actually the swift output is 1, 2. If we add a log to the two init, we will find that

retains the original list propertiesRemove:# list = [' Hello ', ' world ', '] will have an alarm because list is the keyword name = [' Hello ', ' world ', ' hhh ', ' FTL ']# delete 2017print ("Modified before:" , name[0:]) # Remove is an element, not subscript # Name.remove (1)-- ValueError:list.remove (x): X not in Listname.remove (' 2017 ') # Name.remove (name[2]) -the same effect, which is equivalent to removing the print ("Modified:", Name[0:]) After removing the element with the listPop

in url_list: print (URL) http_client = Asynchttpclient () # Asynchronous send request # Encapsulates the URL of the request to HttpRequest (URL), executes the callback function after execution http_client.fetch (HttpRequest (URL), handle_response) # Get an IO loop and add a function into the ioloop.IOLoop.current (). Add_callback (func) # function execution and the request has been sent past Ioloop. Ioloop.current (). Start () # indicates that the request has been

When a request arrives, first determine if the request header content_type is not [application/x-www-form-urlencoded]-If so, assign the request data to Request.body and then parse the data into a dictionary to assign the value to Request.postSo we can use request. Post.get (' username ") gets the data.--if not, the request data is assigned directly to Request.body and is not assigned to Request.post, when the data in the post is emptyPython learns---D

bind a method to a class, all instances are callable:>>> S.set_score (100)>>> S.score100>>> S2.set_score (99)>>> S2.score99For the purpose of limiting, Python allows you to define a special __slots__ variable when defining a class to limit the attributes that the class can add:>>> class Student (object):__slots__ = (' name ', ' age ') # defines the name of the property allowed to bind with a tuple>>> s = Student () # Create a new instance>>> s.name = ' Michael ' # binding attribute ' name '>>>

NumPy, SCIPY contains many advanced digital scientific computing content, some other digital related modules, such as decimal, array, Math/cmath, operator, random and other modules to expand the digital computing.A generator with multiple pseudo-random numbers in the random module:Randint (): Returns random shaping between the two in two shaping parametersRandrange (): Randomly returns an item in the range ([start,]stop[,step]) result, such as Randrange (1,10,2)Uniform (): similar to Randint, b

break and continue statements. Break and continue can cause too many logical forks for code execution and error-prone. Most loops do not need to use the break and continue statements, the above two examples can be removed by overwriting the loop condition or modifying the loop logic, and removing the break and continue statements.Sometimes, if the code is written with a problem, it will cause the program to fall into a "dead loop", that is, forever loop. You can then use CTRL + C to exit the pr

:not Found, the server could not find the requested Web page405:bad method, the server prohibits this request500: Server Internal Error2) Response header information, here are only a few common.Content-type: Specifies what type of data is returned.Set-cookie: Set a cookie to tell the browser to place this content in a cookie and request it next time.Content-encoding: Specifies the encoding of the response content.3) Response body: Usually the data that the server returns to us, such as the sourc

to our local client, This successfully implements the ability to hide our local IP.Why use a proxy? Some Web sites in the back-end processing requests will be detected over a period of time the same IP access times, if the number of times reached a certain value, will be directly denied services, that is, often said IP was blocked. To prevent this from happening, a powerful proxy function is required to hide our IP. When using crawlers to crawl data, if we can constantly change agents, will let

is immutable, you need to declare it, but when the data type is a list, you can add data directly to the list using append and directly cause changes to the global variables)Global: Declare that the elements within a function can be global variables (functions can directly refer to global variables, no global variables are not changed by the function)Nonlocal: Declares that a child function can change a variable of a parent function, but nonlocal cannot change a global variable (a child functio

use this MD5 file to verify the integrity of the data :Md5sum f1>f1. MD5You can follow the following method to permanently vera the file when data integrity :$MD 5sum-c F1.MD5F1: OKAnalysis : If a determination is present , The document is undamaged .Shalsum is another common test algorithm . he generates a length from the given input file + hexadecimal string of characters . its usage and md5sum very similar .Multiple files can be verifiedmd5sum F1 F2 > File.md5$cat FILE.MD542A6AB275D6AE3A62A

PackageCom.pb.demo2;Importjava.util.Arrays;Importjava.util.List; Public classTest1 { Public Static voidMain (string[] args) {String str= "A,b,c,d,e,f"; Listarrays.aslist (str); System.out.println ("Length of List1:" +list1.size ()); for(String s:list1) {System.out.print (s+ "\ T"); } System.out.println ("\ nthe collection is separated by commas"); List)); System.out.println ("Length of List2:" +list2.size ()); for(String s:list2) {System.out.print (s+ "\ T"); } }}Results:Length of List1:

1, tree-l 1/-L 1 (number 1) indicates the level of the directory under "/", and 1 indicates a layerCentOS6.5 the solution to the tree command-bash:tree:command not found:Tree is not installed, install directlyYum-y Install tree2. Add a regular user accountUse the following command to add a common command and set a password for itUseradd AAApasswd 123456Tips:1) Under normal circumstances, the product environment should be avoided directly to the root user operation2) can also be one step by the f

1. Process address Space2. Memory ManagementAllocating space on the stackalloca ()Allocate size on stackStrdupa () copy a string onto the stack (obviously this function is unsafe)digging holes can be a global source audit under this functionStrndupa () copies the specified length of content onto the stackmemory operation function:memset bzeromemmove bcopymemcpymemccpymemcmp bcmpMEMCHR MemmemMemfrobMemory Lock:MlockMlockallMunlockMunlockalldetects if the memory page is on physical memory:MincoreE

Memcache Security DiscussionComparison of Memcache and sessionThe main purpose of Memcache is to speed up, so it is a stateless data, that is, data is not bound to any user.Session data is bound to the user and is therefore a stateful data.Memcache should be put into the intranet, using a firewall to block the external network access to port 11211. Resolute cannot put to the outside net go.Firewalls can also be used under LinuxSetup Configuration FirewallIptables-a input-p tcp-s 127.0.0.1-d Port