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Review review Python provides a large number of excellent function packages for data display. Among them, matplotlib module can easily draw and make high-quality data packages such as line chart, histogram and scatter chart. About the matplotlib module, we have studied the basic framework and common methods of matplotlib in the early stage P ...

Absrtact: using SQL as the entry of data query and analysis is an idea of data full stack. This article is shared from Huawei cloud community< How to use SQL to analyze data? >, author: zuozewei. preface We process user data in real time through OLTP (online transaction processing) system, and we also need to analyze them in OLAP ( ...

Learning objectives target Master common statistical charts and their significancePlot scatter and histogramapplication Explore the relationship between different variables Matplotlib can draw line chart, scatter chart, histogram, pie chart. We need to know the meaning of different statistical charts to decide which statistical chart t ...

catalogue Brief introduction of Markowitz model 1, Principle 2, Correlation formula Example verification 1, Method selection 2, Train of thought ① Assumptions ② Set ③ Attention 3, Practice ① Data preparation ② The combination weight is calculated by Monte Carlo method ③ Select the effective frontier combination ④ Stock performan ...

Python Web Crawler (1) Getting Started Libraries used: requestspip+BeautifulSoup4pip+tqdmpip+html5lib python version: 3.8 Compilation environment: Jupyter Notebook (Anaconda3) Tour: Chrome Knowledge involved: HTML Hypertext Markup Language , What is a crawl 1. Web Crawler (Web Crawler or Web Spider) It is a program that aut ...

Introduction to K-means clustering algorithm k-means clustering algorithm is an iterative clustering analysis algorithm. It is also regarded as unsupervised learning, the simplest clustering algorithm. The overall idea is to divide the data into K groups, randomly select K objects as the initial cluster center, then calculate the dis ...

inherit   Inheritance? Something inherited from your elders The question is: what did you inherit when you inherited?   Class inheritance: What is in the class? Variables and methods class son(father) This can even just write pass But if the method in father wants to pass parameters to object variables Pass parameters in son() Yo ...

requirement analysis (1) Using mysql to store student and administrator information (2) The graphical interface is created through tkinter module to realize the login of the administrator, the addition, deletion, modification and query of student information, and the modification of the administrator's own password. Whole engineering class an ...

If you define a class class Class name: pass How to instantiate an object through a class Attribute correlation Distinction and judgment basis of attributes and variables difference concept A variable is a variable that can be changed“An attribute is a characteristic of an object“ Access rights ...

Title Source: Central Europe 2000 Question No.: ZOJ1205 Topic Description: addition of decimal large numbers Enter description Output description analysis: 1. First, we need to determine how many arrays we need to receive Here is the first input method we traditionally define, which is direct input n=int(input()) # Indicates that th ...