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Introduction When it comes to Python's libraries, you may first think of the following: NumPy: for matrix computing, machine learning;pandas: NumPy-based data processing for standard Excel/SQL tables, or Tidyverse for R;SciPy: Scientific calculation, standard MATLAB;statsmodels: Used for metrological modeling, AER for standard R, or Stata ...

6, Process control 6.1 program structure When a computer solves a specific problem, there are three main situations: sequential execution of all statements, selective execution of partial statements and circular execution of partial statements. The three basic structures in corresponding programming are sequence structure, selection struc ...

Reflection mechanism +JVM explains creating objects at runtime (classLoader) Overview of java reflection mechanism Dynamic language------------------------------------------------------------------------- ◆ it is a kind of language that can change its structure at run time: for example, new functions, objects and even code can be intr ...

preface Hi ~ Hello, everyone, this is the demon king! I send articles ~ usually reptiles, but what Reptiles look too much. It's bad for your health. Let's have some reality today!! It's almost the new year, and my family is urging me. I can't escape this year. Why can't I? The status quo is ba next year Learn the confession code, install ...

From: Micro reading https://www.weidianyuedu.com/content/0117397506434.html 1, Use of asynchronous requests in Spring Boot** 1. Asynchronous request and synchronous request Synchronization request Asynchronous request Features: you can first release the threads and related resources allocated by the container to the request, reduce ...

2. Everything is an object Java is a more pure language than C + +. C + + is too complex. Java is a pure object-oriented language. Everything in Java is an object. 2.1 manipulating objects by reference Use pointers for manipulation in C language and C + +. Java has no pointers, but because everything is an object, the identifier of the ope ...

   before starting the text, first know that the (0, 0) coordinate point in the screen is in the upper left corner and the maximum coordinate is in the lower right corner. 1, Drawing of basic graphics 1. Rectangle    the function of drawing rectangle in OpenCV is rectangle(). void rectangle(InputOutputArray img, Rect ...

2021 is over. This year, Python language made another strong attack and finally won the title of language of the year. C language also successfully surpassed java to become the second place. Java declined slightly, but it still kept the top three Here's a trend chart of TIOBE website, Zhenlou! Next, let's look at these languages we love and h ...

preface For example, I was asked by the interviewer a few days ago what is reflection??? And my answer is!!! Reflection is the key of dynamic language. Reflection allows programs to obtain the internal information of any class with the help of Reflection API during execution, and can directly operate the internal properties and methods of ...

preface Multithreading concurrency is not only a very important part of Java language, but also a difficulty in the foundation of Java. It is important because multithreading is frequently used in daily development. It is difficult because multithreading concurrency involves many knowledge points. It is not easy to fully master the concurrency ...