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Official Python column 51, students stop, don't miss this article starting from 0! In the previous article, the academic committee proposed The idea of making current limiter based on Semaphore semaphore A simple implementation of sum current limiter. The code is running and seems to have no errors. However, careful readers will find that ...

Last month, the company zk cluster had a failure, and then all project teams were required to check whether Dubbo programmatic / generalized calls were used, and @ Reference was forced to generate consumers. The specific reason is that a large number of online service visitors visited zk in a short time and created 2.4 million + nodes, resultin ...

Foreword: when I work, I always use an excel tool class to complete the import and export of Excel. The fool's powerful tool class makes me use API calls carelessly, but in fact, POI doesn't understand how to operate excel. If I change the project or architecture, I don't know how to read Excel with POI, or the complex excel table style won't b ...

Multithreading Foundation Processes and threads In the computer, we call a task a process. The browser is a process, and the video player is another process. Similarly, both the music player and Word are processes. Some processes also need to execute multiple subtasks at the same time. For example, when we use Word, Word allows us to che ...

catalogue 1. Module 2. Package 3. Documents 4. Abnormal 5. Higher order function 1. Module 1.1 concept Python module is a python file, which is written in py ends with Python object definitions and python statements. Modules can define functions, classes, variables, and can also contain executable code 1.2 import module Mode 1: ...

1, Map interface Key and Value form a mapping relationship by storing data through key and Value • Map Used to save data with mapping relationship, so Map There are two sets of values stored in the collection. One set of values is used to save Map Inside Key , another group is used to save Map Inside Value • Map ...

Learning Video: 8 Hours Transfer to Golang Engineer This course is very suitable for small partners with certain development experience, push! Golang Advancement reflex Variable Built-in Pair Structure var a string // pair<statictype:string, value:"aceld"> a = "aceld" var allType interface{} // pair<type:string, value:" ...

1. Design of Invariant Classes Invariant: An object is an immutable object if it cannot modify its internal state (properties) Thread-safe, concurrent modification and visibility issues for immutable objects are another way to avoid competition String classes are also immutable, and all attributes within the class are final The final ...

Preface Good use of tools in go development can greatly facilitate standardized development, the first thing you need to do is to standardize and test. Generally speaking, usage habits are a key gofmt goimports must be used. Go vet golangci-link assists in checking semantics and correcting them.Complete the necessary basic use cases, form-bas ...