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Three things like getting started with Python (dependencies/combinations/inheritance relationships) In object-oriented, there are three relationships between classes: dependency, combination and inheritance. 1. Dependency: A relationship in which the class name or object of a class is passed as an argument to another function is used is a depen ...

Background: The scrollTop of div needs to be changed in the process of doing the project a few days ago, requiring the movement process to be similar to IOS Webview visual area ceiling animation, first fast and then slow. Analysis: css can't set offsetTop. JS needs to change offsetTop dynamically. Faster and slower animation means that scrollT ...

Problem description The @Cacheable annotation provided by Spring Cache does not support configuring expiration times and automatic refresh of caches. We can configure the default expiration time by configuring CacheManneg and configure the expiration time separately for each cache container (value), but it always feels less flexible. Here is an ...

Anti-shake Anti-shake is the conversion of consecutive triggers over a period of time into one trigger. Use scenarios Rather than retrieving data for each input, you can usually retrieve it after a period of time when user input stops, as shown in the following figure: Implementation Code function ...

Grape Command syntax Command Meaning: Set a lifetime for a given key, and when the key expires (lifetime is 0), it will be automatically deleted.Command format: EXPIRE key secondsCommand actual combat: redis> EXPIRE cache_page 30000 # Update expiration time (integer) 1 Return value: Setting successfully returns 1.When the key does not ex ...

Classifier purpose classifier is very important in ovs for streaming classification and performing appropriate actions.Belongs to match in match+action. Classifiers are used in three places in ovs: miss message processing (user-state slow path) /* The returned rule (if any) is valid at least until the next RCU quiescent * period. If the rule ...

In the ovs classifier, rules can be divided into simple rules and associated matching rules in terms of complexity.Simple rules exist independently, association rules exist simultaneously.Association rules need to be hit at the same time to be hit eventually.Association rules have a large impact on performance. Simple Rules In the classifier, r ...

Basic concepts Hash Table: Hash Table, also known as Hash Table. Define a keyword k in the data to be stored. Map k to an address through a mapping relationship f. This address is called hash address. Then when searching for the record, it is no longer necessary to search through data comparison, but directly use the keyword k mapping of the re ...

Task is. NET Framework 3.0. Threads are based on thread pools and then provide rich api s. Thread methods are very powerful, but they are too powerful and unrestricted. The DoSomething Long method is as follows: /// <summary> /// A more time-consuming and resource-consuming private approach /// </summary> /// <param na ...

What is Graphic Verification Code Graphic verification code is a kind of verification code. CAPTCHA is the abbreviation of "Completely Automated Public Turing test to tell Computers and Humans Apart". It is a public fully automated program that distinguishes a user from a computer or a human ...