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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 ...

Chapter I I notes ① Single line note Start with "#" ② Multiline comment Start with three single / double quotes ③ Chinese coding statement notes Add Chinese declaration comments at the beginning of the file to specify the encoding format of the source file #coding:gbk II operator ☝ Add -- "+“ ☝ Minus - "-&qu ...

Catalogue of series articles FFT Use OpenCV to Fourier transform the image, use the FFT function available in Numpy, and some applications of Fourier transform Correlation function: cv.dft(), cv.idft() etc. 1. Theory Fourier transform is used to analyze the frequency characteristics of various filters. For the image, two-dimensional di ...

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 ...

day13 built in functions and Derivations Summary: Anonymous functiongenerator Built in functionAdditional "derivation, which belongs to the knowledge of data type, and the internal high-level usage involves [generator] and [function]" 1. Anonymous function Traditional functions (well-known functions) def fuc(): print("This is ...

Basic process of Python crawler web page:First, select some carefully selected seed URL s.Put these URLs into the URL queue to be fetched.Read the URL of the queue to be crawled from the URL queue to be crawled, resolve DNS, obtain the IP of the host, download the web page corresponding to the URL and store it in the downloaded Web page library ...

preface ui automatic testing is to simulate manual operation through code, and operate browser pages by clicking, dragging and inputting. Our commonly used web automatic testing tool is selenium; At the same time, in our daily operation, we need to create links, load pages, switch windows and other situations, but the execution of the code is ...

Recently, when consulting some questions, some small partners found that many small partners did not know "opportunism" in the process of practical operation. That is the so-called "laziness". The laziness mentioned here is not the traditional laziness and trickery, but learning to "use tools". You should know that ...

Basic operation of file Open / close file The built-in function open can open a file under the specified path and return a file object There are two most commonly used parameters for open. The first parameter is the file name (absolute path or relative path), The second is the opening mode, 'r' /'w '/'a' /'b ', which means read (default) / ...

preface In the front, I made a small program of automatic clock in, which can basically realize the tasks of checking in and checking out after work, and white whored CSDN server as the basis of data sending and receiving. While continuing to optimize functions, small pits in the use of selenium are solved. Locate and switch frame (if ...