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1, Cognition object 1. What is it An object is a collection of key value pairs (k:v), which represents the mapping relationship between attributes and values The order should be considered in the array. The object does not consider the order, but depends on the mapping relationship 2. Object syntax k and v are separated by colons, each ...

sketch PCF8591 is a single chip, single power supply, low power consumption, 8-bit CMOS digital converter According to the acquisition device, it has four analog inputs, one analog output and one Serial I2C bus interface. Serial I / O via I2C bus schematic diagram: Pin definition: SYMBOL PIN DESCRIPTIONtranslationAIN01analog inputs (A ...

promise is a new method proposed by ES6 to solve asynchronous programming problems. 1. Synchronous and asynchronous 1) Synchronization task: Task 2 cannot be executed until task 1 is executed. Synchronization tasks are directly placed in the main thread. 2) Asynchronous task: asynchronous tasks are placed in the event queue. Asynchronous task ...

1, IntroductionREST, namely Representational State Transfer, is a software architecture style. It is a design and development method for network applications, which can reduce the complexity of development and improve the scalability of the system.REST refers to a set of architectural constraints and principles. Applications or designs that mee ...

preface stay Eal:Error reading from file descriptor 33: Input/output error In this article, I described the problem of printing Input/output error when dpdk program in VMWARE environment uses 82545EM virtual network card. This problem was finally solved by modifying igb_uio code repair, after repair, I can't help thinking about how user mode ...

You're right. I don't know if other programming languages and tools can do 10000 popular science short videos a month, but it can be done with the MoviePy module of Python. In 19 years, when I was still in school, the leader arranged for me to use pr to make a popular science short video of traditional Chinese medicine. I really couldn't get t ...

PS: This article is a reprint of the article. It will be more readable to read the original text. There is a link to the original text at the end of the articlecatalogue1. Cued binary tree1. Cued binary treeBefore introducing the clue binary tree, let's take a look at a case. I'll draw a binary tree first, as shown in Figure 1:pictureIf we trav ...

preparation Download the RT thread nano source code: https://github.com/RT-Thread/rtthread-nano/archive/refs/heads/master.zip. The latest version is 3.15 (written on March 1, 2022)New bare metal Keil project of GD32F10x series This article has been described very clearly, so I won't repeat it. Of course, you can find a keil project that can r ...

Since learning Spark requires Scala, here are some basic grammars of scala. be careful: Scala doesn't need a semicolon at the end of a line 1 variable type val is immutable. It must be initialized at the time of declaration, and it cannot be assigned again after initializationvar is variable. It needs to be initialized when declaring. After ...

1. Recognize NumPy array objects One of the most important features of NumPy is its N-dimensional array object, namely the ndarray (alias array) object, which can perform some scientific calculations. Some important properties are defined in the ndarray object. 2. Create NumPy array The simplest way to create an ndarray object is to use th ...