Programmer Group

preface Over the past few years, I have been struggling in the it industry. Along the way, many have summarized some high-frequency interviews in the python industry. I see most of the new blood in the industry, and I still have all kinds of difficult questions for the answers to all kinds of interview questions or collection Therefore, I dev ...

Python - pandas module - Series data structure pandas Numpy is more suitable for dealing with unified numerical array data pandas is specially designed to handle tables and mixed data panda has two data structures: SeriesDataFrame Series The Series data type can store one-dimensional tag array of any type of data (integer, string, floa ...

  1. Module introduction 1.1 what is a module When writing a long program, it is recommended to use a text editor instead of an interpreter to execute the input in the file, which is writing   script  . As the program gets longer and longer, in order to facilitate maintenance, it is best to split the script into multiple files. ...

(the catalog is on the right → Official website file configuration parameter Code file address of this article The preparation section is of personal interest. You can directly see the use section of locust. You can find a public interface test, such as https://www.baidu.com prepare database Start a database # Lifting container do ...

Zero, write in front First of all, it is purely entertainment, and there are many loose places!!           Mankiw's macroeconomics mentioned an example when talking about the CPI (consumer price index), that is, avatar ranked first at the box office with us $761 million at that time, but after considering inflation, a ...

Author: xiaoyu WeChat official account: Python Data Science Purpose: This article introduces you to a primary project of data analysis. The purpose is to understand how to use Python for simple data analysis through the project. Data source: Bloggers collect official account data of Beijing secondary housing through crawler collectio ...

Module expansion and cognition   · Process oriented programming   · Module introduction   · import sentence pattern   · from...import... Sentence pattern   · Circular import problem   · Absolute import and relative Import   · Software development cata ...

1, Configure development environment     the version of Python 3.7.x we currently use was released in 2018. The python version number is divided into three sections, such as A.B.C. Where A represents the large version number. Generally, when the whole is rewritten or there are incompatible changes, A is added; B indicates functio ...

1 reproduction environment PHP 5.6 Decmsv5.7sp2 official version (January 9, 2018) Reproduction process According to gourd painting ladle, water a blog. First download the source code of this version, and then unzip it. See the construction process for details This article After the installation, I can't directly access the home page anyway. ...

1, Introduction to KMeans algorithm: K in the name of KMeans algorithm represents the number of categories, and Means represents the mean value of samples in each category. Therefore, KMeans algorithm is also called k-Means algorithm. KMeans algorithm takes distance as the measure of similarity between samples, and assigns samples with similar ...