Programmer Think

1.print print information with color You know the print function in Python. Generally, we will use it to print something as a simple debugging. But you know, the font color printed by Print can be set. A small example def esc(code=0): return f'\033[{code}m' print(esc('31;1;0') + 'Error:'+esc()+'important') After running this code on the ...

Ant colony algorithm for TSP problem Introduction to TSP issues Traveling businessmen need to visit n cities and finally return to the starting city. They are required to visit each city only once. The optimization goal is to minimize the sum of distances. Example solution results 20 city coordinates: (88, 16), (42, 76), (5, 76), (69, 13), ...

1.MATLAB program implementation The code is as follows: %% Clear environment variables clear; clc; close all; %% Initialization parameters data = rand(400, 2); figure; plot(data(:, 1), data(:, 2), 'ro', 'MarkerSize', 8); xlabel 'Abscissa X'; ylabel 'Ordinate'; title 'sample data '; K = 4; % Number of classifications maxg ...

1, Foreword The pytest configuration file can change the operation mode of pytest. It is a fixed file pytest INI file, read the configuration information and run it in the specified way 2, ini configuration file Some files in pytest are non test files pytest. Ini is the main configuration file of pytest, which can change the default be ...

I've been struggling whether to talk about the head movement first or the spatial coordinate system first. Later, I decided to talk about the head movement first, so that we can first feel how the manipulator is positioned in space, and then we will introduce in detail the spatial coordinates of the manipulator in the next section. Spatial coor ...

python data analysis tool The data analysis function of python itself is not strong, so we need to install some third-party extension libraries to enhance its corresponding functions. Extension library related to python data analysis and mining; expanded memory bankbrief introductionNumPyProvide array support and corresponding efficien ...

When we are reptiles, we often these situations: The website is complex and will encounter many repeated requests. Sometimes the crawler is interrupted unexpectedly, but we don't save the crawling state. If we run again, we need to crawl again. There are such problems. So how to solve these repeated crawling problems? You probably think of ...

iterator Generally speaking, the process of extracting data from an object in turn is called traversal, and this means is called iteration (repeatedly execute a certain code block, and take the result of each iteration as the initial value of the next iteration). Iteratable object: refers to the object that can be used for... in... Loop, such ...

Python 0-1, lecture 2. In the last chapter, we learned variables and how to define a variable. From now on, we can use it directly. In this chapter, let's learn string. Let's have a look. character string What is a string? Is it important? name = 'Hello World' print(name) 'Hello World' here is what we call a string. Name is its variable. ...

Arrays and linked lists Array features 1. Continuous: sequential storage. 2. Fixed length: once defined, the length cannot be changed. 3. According to the subscript, you can directly access the elements of this subscript. 4. It is not suitable for inserting, deleting and other operations. In python, the list is a dynamic array Linked li ...