effective python

Public:7 Virtual voidfly ();8 ...9 };Ten classPenguin: PublicBird { One...//no fly function is declared A - -};This inheritance system is more loyal to reality than the original design.Things about these poultry are not over yet, because for some software systems there is no need to differentiate between flying and flightless birds. If your application pays more attention to the bird's beak and bird's wings and is indifferent to whether or not to fly, the first two-class inheritance system i

Issue backgroundThe recent 2 days are ready to re-read "Effective Java", found that these classic books are really look over and over again feelings. The process of learning is also becoming more and more aware of a repetitive process. This encounter problem is in the 17th article saw, looked for a long time did not understand the visual code. The content of article 17th is either designed for inheritance, provides documentation, or prohibits inherit

Brief introduction:Recently the company project close, you can have time to read the book. "52 Effective ways to write high-quality iOS and OS X code" this book explains many of the skills and specifications of iOS development, highly recommended!Here are the notes that you took when reading your book, as usual, first on the list:Directory:Chapter One: Familiarity with objective-cChapter II: Object, Message, RuntimeChapter III: interface and API desig

This article records some of my own understanding and experience when I read effective modern C + +.Item1: Template type derivation1) The reference property cannot pass in a template function by passing a value parameter . This means that if a template function requires a parameter of type reference, it must be declared as reference in the template declaration, otherwise the result of the type deduction will not have the reference attribute, even if t

"Effective C + +"Clause 26: Delay the occurrence of variable definitions whenever possibleas long as you define a variable and its type has a constructor and destructor, then when the control flow of the program reaches the variable definition, you will have to bear the cost of the construction, and when the variable leaves the scope, you have to inherit the composition. Even if the variable is not used at all, it still costs a lot, so you should try

"Effective C + +"Article 33: Avoid hiding the inherited nameMasking behavior is related to scope. Examples are as follows:int x;//global variable void Somefun () {Double x;//local variable std::cin >> x;//read a new value give local variable x}The statement that reads the data refers to the local variable x, not the global variable x, because the name of the inner scope obscures the name of the perimeter scope.For example:Class Base{private:int x;publ

3.4 Details of cookies1:void setpath*java.lang.string URI): Sets a valid access path for the cookie. Valid path to the cookie that the valid path refers toWhere it is stored, the browser takes cookie information when it accesses the server under a valid path, otherwise it does not have cookie information.2) void Setmaxage (int expiry): Sets the effective time of the cookie.Positive integer: Indicates that the cookie data is saved in the browser's cach

All the time, I think entering link: your domain name in the Baidu search box will greatly affect the ranking of websites. However, after some time of hard work, I think this idea is not enough. All the time, I think entering link: your domain name in the Baidu search box will greatly affect the ranking of websites. However, after some time of hard work, I think this idea is not accurate enough. To sum up, anti-chain should be divided into three types: 1. anti-link on the homepage of the exter

Easyrecovery commonly known as "easy Recovery", is a professional level of data recovery software, for accidental deletion, mis-formatted or lost files can be easily retrieved. There are three versions, the Enterprise Edition is the most powerful, supporting almost all types of file recovery, but also support raid data recovery. The operation is very simple, fully follow the prompts to restore the USB flash drive, hard disk, CD-ROM, flash, mobile phones, digital cameras and other media data. The

Effective XML:DTD (document type definition) Introductionvalid (Valid) XML document :First, the XML document is a formal (well-formed) XML document;Second, the requirements of the DTD need to be met, such an XML document is called a valid (Valid) XML document .DTDA DTD, which is a document type definition, is a texttype. A DTD is used to describe the structure of an XML document.　　A DTD document contains:The rules for defining elements (element);The

For example, a person to the same article constantly refreshed, this can not be counted as effective. My idea is that when the user first browse the article, save a Cookie,cookie in the ID of the article, the validity of one hours, if the same hour, the user access to the article, if the cookie exists is not recorded. I do not know that people do not have more high-end, friendly statistical methods. Reply content: For example, a person to the sam

The effective integration of life teaching and information technology classroomThe teaching of life is a new term that accompanies the reform of the curriculum. Baidu on the life of the teaching has such an explanation, the so-called life-teaching is to put the teaching activities in the real life background, so as to inspire students as the main body of life to participate in the activities of the strong desire, at the same time the purpose of teachi

problems on the spot (or later). This is the case for both parties (or multiple parties) after each effective communication) there is a profound and open-minded listening and understanding of the point of view. Second, the inevitable result of the "debate" is that both parties (or multiple parties) have a higher awareness of the issues discussed, this is a very effective and gratifying communication progre

Effective managers must pay attention to contributions and understand how to combine their work with long-term goals. Most managers do not do this. They pay attention to diligence, but ignore the results. What they care about is whether the organizations and superiors they serve treat them badly and what they should do for them. They complained that they did not have the authority, and the result was that the work was ineffective. A person who attach

measures taken to mitigate the loss. In many cases, goodwill and trust will be vigorously undermined by the apt target attack, which must also be addressed.4 , LearningWhen the attack is over, the organization needs to figure out what it can learn from it. Each attack has a lesson for defenders-what works? What can we do better? It may also indicate that some assumptions and information about planning for security events are incorrect or incomplete.However, it is also important not to overreact