Programmer Group

Sort rule Because it's Chinese people who are accustomed to putting Chinese folders in front of them, they add their own sorting rules on the basis of other blogs (https://blog.csdn.net/da_caoyuan/article/details/56664673). The default sorting rule is to sort according to the ASCII code table (http://ascii.911cha.com/), and the steps of sorti ...

Due to the rapid development of the Internet, all the information is in a state of massive accumulation. We need to obtain a large amount of data from the outside world and filter the useless data in a large amount of data.We need to specify a crawl for our useful data, so there are now crawling techniques that allow us to quickly get the data ...

Let the output start and end time, did not expect that matlab is output like this, feel egg pain incomparably in an instant 5.0000000e+01 4.8000000e+01 4.9000000e+01 5.6000000e+01 4.5000000e+01 4.9000000e+01 5.0000000e+01 4.5000000e+01 5.0000000e+01 4.8000000e+01 3.2000000e+01 4.9000000e+01 5.7000000e+01 ...

A built-in function 1. Revsedflip, return iterator # take s Inversion s = 'It's not Shanghai. Tap water comes from the sea' # Method 1 print(s[::-1]) # Method two s1 = reversed(s) i = '' for el in s1: 　　i +=el 　　print(i) Slice slice lis = ['nishi','woshi','shuia','benjim'] s = slice(1,3) print(lis[s]) 　　3.formate # Format output s = ...

I. thinking caused by one question Today, I ran into a problem in leetCode Original question link: https://leetcode.com/problems... This problem requires the implementation of a function from upper case to lower case. At that time, the first thing that came to mind was that js did not provide atoLowerCase function? So I wrote down the answer ...

AFNetworking is a well-known tripartite library for the iOS world and has completely replaced ASI.The latest AFNetworking3.0 has also been switched from NSURLConnection to NSURLSession for ease of use.As an experienced iOSer who is constantly exploring, you should also look at the internal merits of source enhancement. 1. Overview First, look ...

Reasons for cross domain error reporting After the video is uploaded successfully in the first place, the src of the video tag will directly introduce the resource address of the uploaded server, and then the cross domain error message will appear when using the canvas screenshot. Failed to execute 'toDataURL' on 'HTMLCanvasElement': Tainted c ...

package com.java.design.java8; import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.test.context.junit4.SpringRunner; import java.util.Arrays; import java.util.Compar ...

Create the banner.txt file in the src/main/resources directory of the project, and the startup output of SpringBoot will be changed Buddha log ${AnsiColor.BRIGHT_YELLOW} ${AnsiColor.BRIGHT_RED}_ooOoo_${AnsiColor.BRIGHT_YELLOW} ${AnsiColor.BRIGHT_RED}o8888888o${AnsiColor.BRIGHT_YELLOW} ${An ...

Given a string, verify whether it is a palindrome string, only consider alphabetic and numeric characters, and ignore the case of letters. In this paper, we define the empty string as a valid palindrome string. Example 1: Input: "A man, a plan, a canal: Panama" Output: true Example 2: Type: "race a car" O ...