Detailed explanation of the factory mode used by architects' internal mental skills and classic frameworks

1, Classical frameworks are using design patterns to solve problems Spring is a classic framework that uses design patterns incisively and vividly. In fact, it can be seen from the class name. Let's list one by one: In particular, design patterns are never used independently by a single design pattern. In general, it is often a mixture of mult ...

Posted on Thu, 20 Feb 2020 00:52:21 -0500 by angelorigo

Android - shared preferences storage (including source download)

Android system provides a lightweight data storage method - shared preferences storage. It shields the operation of the underlying file, and provides a simple programming interface for the program developers to realize the most simple way to permanently save the data. This method mainly saves a small am ...

Posted on Wed, 19 Feb 2020 23:07:07 -0500 by twilson

Introduction to Stream syntax

1, About Stream Stream is a key abstract concept in Java 8 to deal with collections. It can specify the operations you want to perform on collections, and can perform very complex operations such as finding, filtering, and mapping data. Using Stream API to operate on collection data is similar to database query using SQL. You can also use the ...

Posted on Wed, 19 Feb 2020 21:51:01 -0500 by shonuff

Fight against new coronavirus: a balanced analysis of national cure and new cases

# default_exp china # The above line is used to declare the name of this module in nbdev. Must be the first row of the first Cell of the notebook. china_balance Description: fight against new coronavirus (7) - Analysis of the balance between national cure and new cases. Function: load the data/china.csv file for drawing output and anal ...

Posted on Wed, 19 Feb 2020 13:15:43 -0500 by itpvision

[leetcode algorithm - determine the number of palindromes]

1, Title Requirements *Determines whether an integer is a palindrome. Palindromes are integers that are read in the same positive (left to right) and reverse (right to left) order. * example 1: * *Input: 121 *Output: true * example 2: * *Input: - 121 *Output: false *Explanation: read from left to right, it is - 121. Read right to left ...

Posted on Wed, 19 Feb 2020 12:39:34 -0500 by soccerstar_23

Several common methods of parsing XML with Python

This article mainly introduces several common methods of parsing XML in Python, including the example introduction of using ElementTree module quickly, etc. for your friends, please refer to the following I. Introduction XML (eXtensible Markup Language) refers to eXtensible Markup Language, which is ...

Posted on Wed, 19 Feb 2020 10:21:06 -0500 by jme

Illustration of kubernetes resource QOS mechanism implementation principle

QOS is a resource protection mechanism in k8s, which is mainly a control technology for uncompressed resources such as memory. For example, in memory, it constructs OOM scores for different pods and containers, and with the help of the kernel's strategy, so that when the node's memory resources are insufficient, the kernel can kill which priori ...

Posted on Wed, 19 Feb 2020 10:21:13 -0500 by mandrews81

Python notes: Chapter 1 of Python 3-cookbook (data structure and algorithm)

Each section of Python 3-cookbook discusses the optimal solution of Python 3 in a certain kind of problem by three parts: problem, solution and discussion, or how to better use the data structure, function, class and other features of Python 3 in a certain kind of problem. This book is of great help for deepening the use of Python 3 and improvi ...

Posted on Wed, 19 Feb 2020 08:48:31 -0500 by idevlin

Python version simple grid strategy

There are not many Python strategies in the strategy square. A python version of grid strategy is written here. The principle of strategy is very simple. A series of grid nodes are generated in a fixed price distance within a price range. When the market changes, the price reaches a grid node price position, and a purchase order is placed. When ...

Posted on Wed, 19 Feb 2020 05:30:40 -0500 by ulrikqk

Python 3 standard library: enum enumeration

1. enum Enumeration is a collection of symbol names (enumeration members). Enumeration members should be unique and immutable. In enumeration, members can be compared in identity, and enumeration itself is iterative. 1.1 create enumeration You can use class syntax to derive Enum and add class properties that describe values to define a new enum ...

Posted on Wed, 19 Feb 2020 05:24:05 -0500 by TexasMd91