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23 Design modes (21)-Enjoy meta mode In the book "Java and Patterns" of Dr. Shanhong, this describes the Flyweight pattern: ❈ Flyweight in boxing is the most lightweight, that is, "The fly level" or "rainfall level", where the choice to use the "enjoy meta-mode" of the free translation, because it is more reflective of the intention of the model. The enjoy meta

Objective The enjoy meta-mode is also a structured model, which is the last of a description of the structural pattern (because the proxy mode was written earlier). The enjoy meta mode takes a share to avoid the overhead of having the same content object in large numbers. The most common and intuitive kind of overhead is memory loss.Enjoy meta-mode definition Enj

Error | design | Web page design Common mistakes and consequences of meta tags in web design [abstract]: The common mistakes of META tag description and keyword writing in web design include: All pages of the site use the same META tag content, meta tags in the Web page introduction information and the content of the s

1. Add method: Open the application/admin/common/function.php file, locate function get_attribute_type ($type = "), and add a ' uploadpics ' under line 86th > Array (' Bulk upload image ', ' varchar (255) not NULL ');After adding this item, you can

Meta is an auxiliary label for the HTML language Head area. Maybe you think the code is optional. In fact, if you can use a good meta tag, will give you an unexpected effect, meta tags are: Search engine optimization (SEO), the definition of the use of the language page, automatic refresh and point to the new page, the implementation of the Web page conversion dy

Objective Wenzu the corresponding English is metatable, the meta method is Metamethod. As we all know, in C + +, two classes cannot be added directly, but if you overload the "+" symbol, you can do the addition of the class. There is also this truth in Lua, where you cannot directly "+" a variable of two table types, and if you define a specified function, you can do so. So this post is mainly about how to define this specified function, what is this

asp.net IntroducedThe motherboard page is a very powerful feature in ASP.net 2.0, but it does not provide a basic approach to search engine optimization. If you want your Web page to be indexed and enhanced by search engines, then you need to specify a title and meta tag on each page. This article explains how to extend your asp.net page so that you can specify the description of your meta tag and the keywo

1. Definition languageFormat:〈meta http-equiv=〃content-type〃content=〃text/html; charset=gb2312〃〉This is the most common use of meta, in the production of Web pages, under the pure HTML code will see it, it is to define the language of your Web page, when visitors browse your page, the browser will automatically recognize and set the language in the page, if your page is set to GB code, and visitors do not i

Understanding and simple use of Python classes and meta-classes (Metaclass)(i) Classes in PythonFirst, the Python classes discussed here are based on modern classes that inherit from object.First in Python, everything is an object. It's very important to understand the meta-class. I'm going to try to understand the classes in Python.class Trick (object): PassWhen Python executes the band class statement

Meta is an auxiliary label for the HTML language Head area. Using meta tags in almost every web page can have unexpected results. Meta is an auxiliary label for the HTML language Head area. In almost all of the pages, we can see HTML code similar to the following paragraph:Maybe you think the code is optional. In fact, if you can use a good

First, the PrimerMeta-class belongs to the Python object-oriented programming of the Deep magic, 99% of people are no avail, some think to understand the meta-class is actually also justified, donuts, from the team of the control of the meta-flawed, logic confusion;Second, what is the meta-classIt all comes down to a sentence: everything in Python is an object. L

The detailed meta is an auxiliary label for the HTML language Head area. In almost all of the pages, we can see HTML code similar to the following paragraph: Maybe you think the code is optional. In fact, if you can use a good meta tag, it will bring you unexpected results, such as the keyword will automatically be collected automatically by the large search site, you can set the page format and refresh a

1. Dynamically create a class using type (type is a class that is used to create a class object's meta-class, so it can also be inherited )Type ("person", (), {"name""John" })2. Meta-classThe classes in Python are also objects, and the meta-class is the class that creates these class objects, which can be understood asMyClass == MyClass ()3.type is actually a

according to the type of object passed to the function or method. Even without introspection, functions are often divided according to the instance data, for example, the route to the Jane.room_number is different from the route to the Bob.room_number, because they are in different rooms. With introspection, you can also skip the calculation of Bob while safely calculating Jane's winnings, for example, because Jane has the. Profit_share attribute, or because Bob is an instance of subclass hourl

Enjoy meta mode descriptionDefinition: A shared problem used to solve a large number of fine-grained objects in a system:Key words: separation and sharing;Description: Enjoy meta-mode divided into simple (shared) Enjoy meta-mode, and combined (not shared) to enjoy the meta-mode, share and not share the sub-mode, simply

Data about Data Warehouse, refers to the data source definition, target definition, transformation rules and other related key data generated in the process of data warehouse construction. The metadata also contains business information about the meaning of the data, all of which should be properly preserved and managed well. It is convenient for the development and use of data Warehouse.Data about data that is used to construct, maintain, manage, and use data warehouses is particularly importan

This is a very hot post on stack overflow. The questioner claims to have mastered various concepts in Python OOP programming, but has always felt that the meta-class (Metaclass) is difficult to understand. He knows that this must be related to introspection, but still not very clear, and hopefully you can give some practical examples and snippets to help understand and under what circumstances you need to do meta