[Liao Xuefeng python tutorial learning] - advanced features: list generation, generator and iterator
Continue with an advanced feature - slicing and iteration
1, List generation
List Comprehensions is a very simple but powerful built-in Python generator that can be used to create lists.
1. Basic use of list generation
1. Use list(range(1,11)) to generate list: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>>> list(range(1,11))
[1, 2, 3, 4 ...
Added by johncollins on Mon, 28 Feb 2022 14:47:00 +0200
C + + learning notes - class
preface
The three characteristics of C + + object-oriented are encapsulation, inheritance and polymorphism The meaning of encapsulation is to take the attributes and behavior as a whole, express or even the food in, and control the attributes For example, human attributes include not only inherent attributes such as age, height and weigh ...
Added by rajatr on Mon, 28 Feb 2022 14:40:53 +0200
Chapter 5 sorting and paging
1, Sort
1.1 sorting rules
Sort using ORDER BY clause
ASC (ascend): ascendingDESC (descend): descending order
The ORDER BY clause is at the end of the SELECT statement
1.2 single column sorting
Example 1:
mysql> SELECT last_name, job_id, department_id, hire_date FROM employees ORDER BY hire_date;
+-------------+------------+------- ...
Added by w3evolutions on Mon, 28 Feb 2022 14:30:46 +0200
JS case: support Canvas electronic signature function on PC and Mobile
preface: During this period of time, a new requirement was encountered during the project iteration. A Pc version electronic signature function was implemented based on react, and pictures were generated and uploaded. So I thought signature_pad And used this plug-in in the project I have to say that the wheels made by others are really fragrant ...
Added by bubatalazi on Mon, 28 Feb 2022 14:24:18 +0200
LeetCode brush notes binary tree path sum
112 path sum
Given a binary tree root and a value sum, judge whether there is a path where the sum of node values from the root node to the leaf node is equal to sum.
Enter a binary tree and a given integer, and output a Boolean value to indicate whether there are paths that meet the conditions.
Input: root = [5,4,8,11, null, 13,4,7,2, nu ...
Added by kat89 on Mon, 28 Feb 2022 14:18:07 +0200
Chapter 1 basic algorithm ACwing
Chapter I basic algorithm (I)
1, Content overview
Master the main ideas and have a deep understanding
Understand and memorize the code template (master the idea)
Template topic exercise
Understanding + memory
1. Sorting:
Quick rowMerge sort
2. Two points
Integer dichotomyFloating point binary
2, Quick sort
The main idea of ...
Added by orbitalnets on Mon, 28 Feb 2022 14:09:13 +0200
Jenkins+Docker+Gitee+SpringBoot Automated Deployment
When we use the traditional development method to develop the background system, we need to re run the project every time we write a function point, and then test it. If the project is relatively small, it is OK, but if the project is relatively large, this development method is more troublesome due to the large number of personnel involved. Ba ...
Added by amethyst42 on Mon, 28 Feb 2022 14:04:33 +0200
AOP - aspect oriented programming
1. What is AOP?
AOP is aspect oriented programming, which extends the method without modifying the source code!!! It solves the coupling of business When we usually write code, we will implement various methods in the control layer, but too much code writing will lead to code redundancy. How to solve this problem? Then you need to use the ...
Added by edcaru on Mon, 28 Feb 2022 13:45:45 +0200
Java learning (JDBC (concept, detailed explanation of various interfaces and classes (DriverManager,Connection,StatemeResultSet,PreparedStatement), control transaction) login exercise)
2022/2/28
1, Basic concepts of JDBC 1. Concept: Java database connectivity, Java database connection, Java language operation database 2.JDBC essence: in fact, it is an officially defined set of rules for operating all relational databases, that is, interfaces. Each database manufacturer ...
Added by gazfocus on Mon, 28 Feb 2022 13:24:58 +0200
C + + template primary and STL
Template 1
1.1 generic programming
First, let's add two numbers
int Add(int x, int y)
{
return x + y;
}
double Add(double x, double y)
{
return x + y;
}
char Add(char x, char y)
{
return x + y;
}
Although function overloading can be implemented, there are several disadvantages:
Overloaded functions only have different types, and ...
Added by mapleleaf on Mon, 28 Feb 2022 13:19:28 +0200