Programmer Think

1. Foreword Python is a very easy-to-use explanatory language. Its main features are as follows: Easy to learn and useScalable and portableRich third-party library It is precisely because of these characteristics that Python is widely used in some scenes with simple logic and complex functions. In recent years, with the rapid development of a ...

Vectorization of code means that the problem to be solved is vectorized in essence. It only needs some numpy skills to make the code run faster, but vectorization is not very easy. Vectorization code example: game of life The universe of life game is a two-dimensional orthogonal grid. Each grid (cell) is in two possible states, life or death. ...

This article is translated from Python & APIs: A Winning Combo for Reading Public Data Article code address https://github.com/realpython/materials/tree/master/consuming-apis-python?__s=kea6w26ii09uqhijmy0b Python+API: a perfect match for reading public data go to top Learning to use different APIs is a magical skill, and many applica ...

preface As we all know, numpy library is the basic library of scientific computing. We learned earlier that the numpy ndarray object requires the homogeneity of data elements in the array. At the same time, the memory space of numpy array element values is the same, and the bottom layer adopts two storage methods: C-order (row first storage) o ...

sigmoid activation function Function expression: Function image: From this figure, we can see the following characteristics of sigmoid activation function: 1. When the input is greater than zero, the output must be greater than 0.5 2. When the input exceeds 6, the output will be infinitely close to 1, and the discrimination function of ...

preface Hello, I'm sailing. We may not be very familiar with the registry, because we usually use less; However, it is the core of Windows. Many software startup and logging are included in it. It can be said that it is a large database. Today, let's take a look at how Python operates the registry.   1, Registration form first meeting Ther ...

I A brief introduction to python 1. The bottom layer of Python is different from c. It is an explanatory language. It is not compiled into an executable file, but implemented by interpreting it to the bottom layer of the computer c codepython codeCompiler compiles to executableExplain to the bottomBottom implementationBottom implementation 2. ...

There are many basketball games on the Internet. Here we use pygame to write one. There is a shooter and a defender in the game. The shooter dribbled the ball to avoid defense, jumped up and shot, and scored a point. The closer the shooter is to the basket, the higher the shooting accuracy, but the closer he is to the basket, the more likely he ...

Crawler instance and requests module The underlying implementation of requests is urllib. requests encapsulates urilib, which is easy to use. requests can help us decompress the (gzip compressed) response content. Simple application of requests import requests r = requests.get('http://www.baidu.com') print(r) print(r.status_code) #< ...

asyncio asynchronous programming Official documents: Chinese version: https://docs.python.org/zh-cn/3.8/library/asyncio.htmlEnglish version: https://docs.python.org/3.8/library/asyncio.html 1. Event cycle Event loop means that every time the main thread empties the tasks in the execution sequence, it goes to the event queue to check whether ...