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Requests library is the most important and common library in Python crawler. You must master it skillfully Let's meet this library Requests library is the most important and common library in Python crawler. You must master it skillfully Let's meet this library import requests url = 'http://www.b ...

I. Threads What is a thread? The basic unit of CPU scheduling and allocation. When the current thread CPU time slice is exhausted, it will cause the next operating system scheduling, such as CPU, to execute when it is its turn.The operating system does not allocate memory for threads, but groups of ...

Obviously, the search performance of the general HashSet < T > class is higher than that of the general list < T > class. Just compare the hash based key with the linear method in the list < T > class. However, it may take some CPU cycles to calculate the hash key itself, so for a small number of items, linear search can r ...

0. Preface Because the epidemic is busy with other things for a long time, I don't want to see a more complete poc framework and principles here to share with you to learn and discuss. 1. The frame code is as follows #!/usr/bin/env python #coding:utf-8 import requests class misiinfo(object): ...

Post slot Mail slot is a one-way interprocess communication mechanism provided by Windows operating system, which can be used in single machine or multi machine distributed environment on network. For relatively short low-frequency messages, it is usually easier to use a mail slot than a named pipe o ...

At first, when using Qt to display point cloud, every time a new project is created, the directory must be configured, which is very troublesome. Recently, I suddenly realized that I can create a new property sheet, and every time I refer to the property sheet, it's OK. It taught us to be flexible. 1. ...

I. Introduction I've been learning Python for a long time. I've heard that Python crawlers are so powerful before. I've just learned here. I wrote a crawler program with the python video of little turtle, which can download simple web pictures. Two, code __author__ = "JentZhang" import urllib.request import os import random import re def ur ...

Reptile thinking The first step is to get the data we need Tencent, Netease, clove doctor and other platforms have real-time data of the epidemic. After crawling the data of each platform, it is found that the data returned by Dr. lilac is static. If you want to crawl in Tencent and Netease, you nee ...

Array of C ා basis This paper introduces the array in C ා language, and realizes the program of prime number (bool array) and block game (button array) by the array. I. array 1. Array overview An array is a combination of data of the same type Array belongs to reference type How to declare a one- ...

Suppose a bank has K windows open for service. There is a yellow line in front of the windows which devides the waiting area into two parts. All the customers have to wait in line behind the yellow line, until it is his/her turn to be served and there is a window available. It is assumed that no window ...