blackjack lessons

"first chicken, first egg", entangled in it. Users, relationships, and strong resource and topic production capabilities need to be developed in the early stage. Here are some suggestions for colleagues who are interested in social apps:If you don't have a lot of resources, don't invest in social apps. This is a money-burning thing. Obtain user resources, which can be diverted from other places. For example, the first public account to attract target users. Or, you can develop the correspondin

Lessons learned from the project: 01. The network of the test environment and development environment must be separated; 02. data Consistency Issues (mainly front-end databases and back-end databases; data should be classified based on their own characteristics, and "important data" should adopt a feedback mechanism (Note: regular check mechanism ); "Common data or big data Data" adopts no feedback mechanism (Note: 1. for stateful data: dual channel

blog, restart the basic algorithm of learning, do not want to get what a great prize, just down-to-earth Step by stepImpetuous seems to have been accompanied by me, took me the wrong way, around a circle. I am a word not much, but really work hard, more than 300 days I a nearly 300 questions, the middle with a lot of pain, every day of the curriculum and the faith in my heart let me every day in the insistence, if not detours, I think I have gone quite far away. But I actually do not have much

; } Else{Console.WriteLine ("the date you entered is malformed, please re-enter:"); } } } } Else{Console.WriteLine ("the date you entered is malformed, please re-enter:"); } } Break; } Else{Console.WriteLine

I've never written a log information code for program debugging (reason: 1. Lazy. 2. Console.log () will not be spelled. 3. Rely on the debug breakpoint), so I developed a low efficiency, has been thought to be able to one step, the result of a flop, affecting the development progress.Therefore, I want to learn this lesson, the future development must write the log code, can not be too dependent on debug breakpoint debugging.Where to write the log is as follows:1. Send data content (parameters).

function specified in the Outputdstream, such as print in WordCount, This function is bound to pass to Foreachdstream, which will hand over the function to the last Dstream-generated rdd, the RDD print operation, which is the RDD trigger action.Summarize:With spark streaming you can handle a variety of data source types, such as database, HDFS, server log logs, network streams, which are more powerful than you might imagine, but are often not used by people, and the real reason for this is the

modes, I used the AB command to simulate 1000 concurrent test 10000 words, the test results are quite unexpected, in order to confirm the results, I have repeatedly tested more than 10 times, and on two servers have been tested again. The results showed that the difference between bio and NiO was very weak, no wonder it was bio by default. However, with APR, the speed of connection establishment will be 50%~100%. Calling the operating system layer directly is very fast, it is highly recommended

" have started.Then there is the core, the definition of Internet thinking:First, rely on the Internet to do the dissemination, to find the target group, but also let the target group of customers know you, to participate in and interaction;Second, the user as the core of product development, according to find the target customer group to do the precise "narrow-crowd products";Third, micro-improvement, high-speed iteration, the internet means to collect feedback. Quickly improve products and re-

First look at a code:Fd_set readfs,writefs; intMAXFD =-1; structtimeval TP; intNret =0; Unchar brcvbuf[2048]; Tp.tv_sec=2; Tp.tv_usec=0; Fd_zero (Readfs); Fd_zero (writefs); Fd_set (G_isockid,AMP;READFS);/*G_isockid for the socket to be detected*/maxfd=Max (MAXFD, G_isockid); Maxfd+=1; Nret=Select(Maxfd, readfs, writefs, NULL, TP); if(Fd_isset (G_isockid, readfs))/*determine if there is data*/{ndsize= Recv (G_isockid, Brcvbuf,sizeof(BRCVBUF),0); }Yesterday's look no big problem, but select in th

. Shallow copy copies only the parent object and does not copy the child objects inside the objectDeep copy copy objects and their sub-objects8. Built-in functionsVARs () dictionary type__name__9. FunctionsFUCN (*args,**kwargs)10. File operationwith open () as X, () as Y: Multiple files can be openedA. Lambda simple functionMap Reduce Filter13. Generator Yield xrange14. The adorner functions as a parameter of a functiondef auth (func):def inner ():print ' Before 'Func ()print ' after 'return inn

Today, just after playing Codeforces, the first three questions are very fast, and they are all disposable. Then the rest of the more than half time, feel that the D problem must not be done, and then have been looking at the list, chatting in the group, or playing some other things. Then half an hour later, the students look at the question said can engage, I feel his level and he almost, and then the quiet heart to do, the results in the last minute to write, less output a value, unfortunately

The automatic scrolling effect of the page, which can be implemented by JavaScript,But there is an HTML tag-Use marquee tags not only to move text, but also to move pictures, tables, and so on.Syntax:Important attributes:1. Scrolling direction direction (including 4 values: Up, down, left, and right)Syntax: 2. Scrolling mode behavior (scroll: cyclic scrolling, default effect; slide: stop only once scrolling; alternate: rotate back and forth)Syntax: 3. Scrolling speed ScrollAmount (scrolling spee

interviews with user surveys.Our group and data processing team have extensive and in-depth knowledge of the background and requirements of the data processing team through detailed interviews. This method is time-consuming and laborious, but it can obtain the demand information directly.2. Design: Design Method--uml.Drawing a design into a picture is easier to understand.　　3. Implementation: Development phase-daily build.Daily scrum and TFS source code control.4. Test: Unit test-through the JU

clear points:A Controls the Gpioport output of the BBB board by 0 or 1. The value of the value file under the corresponding gpioxxx under the/sys/class/gpio folder is changed.B Change the Gpioport input and output mode is to change the/sys/class/gpio folder under the corresponding gpioxxx under the direction file value is in or outC The entire BBB board hardware Device control by reading and writing the corresponding Linux device virtual files, so learning BBB board file Structure system is ver

ThinkPHP project CMS content management system development video tutorial [20 lessons] (3.02 GB)-Fu BA Resources Network ThinkPHP background: ThinkPHP is a free open source, the quick and simple object-oriented lightweight PHP development framework follows the Apache2 open source protocol and is born to develop agile WEB applications and simplify enterprise-level application development. It has many outstanding functions and features. after more than

This is a creation in Article, where the information may have evolved or changed. Kris Nova, of Microsoft, shares lessons on over-engineering from she experience contributing to Kubernetes Kops. In hers spare time, she runs a Kubernetes special Interest Group bringing Kubernetes to AWS, all and working on Microsoft Acs. She ' s writing a book called Cloud Native Infrastructure. She has contributed to the Go core codebase and helps moderate community d

the meeting, but if does not have this feeling, he will not know in the future this thing will use, has no use. Use the early prototypes, try them out in a similar situation, and discover some of the major design problems early on, so that you don't find the problem until after it's done. Finally, the author gave an interesting example, if you were in a laboratory with a lot of electronic equipment, suddenly found in the clothes pocket 2 The candy melts, what will you do with it? Some people wi

Two problems were debugged yesterday. However, every problem should not occur. Give yourself a lesson, and remember it later, and use it as a summary. I found myself analyzing the problem-> the process of solving the problem and grasping the main contradiction is not good yet, and it is a bit blind. The following two questions are recorded:1. the type of the WebService return value has been adjusted, and some simple changes have been made in the aspect. Compilation is normal, and no correct r

to make conditional judgments based on the length of a string in your project code, it is highly recommended that you use Isset () directly, because after the same conditions, isset () is about five times times the speed of strlen (), so: The two criteria above can be used to achieve the same goal, but I recommend the first one. http://www.bkjia.com/PHPjc/1042065.html www.bkjia.com true http://www.bkjia.com/PHPjc/1042065.html techarticle 9 Lessons