Python learning notes - detailed explanation of Python multi process

1, Introduction to multitasking 1. General Multitasking allows two functions or methods to execute at the same time. The advantage is that it makes full use of CPU resources and improves the execution efficiency of the program. The concept of multitasking: multitasking refers to multiple tasks at the same time. For example, the computer ...

Posted by Sphen001 on Sun, 02 Jan 2022 12:53:08 +0100

Ten JS tips you don't know

Summed up some commonly used JS tips to make your code more elegant! 1. Use const definition Don't over declare variables in development, and try to use expressions and chain calls. Then, if you can use , const , don't use , let. After you write too much about this mode, you will find that you can hardly find several places to use &quo ...

Posted by Vasudhevan on Sun, 02 Jan 2022 11:49:36 +0100

day 19 regular expression

day 19 regular expression 1, Regular expression Regular expressions are a tool to simplify complex string problems Match symbol 1. Introduction to re module re module is a system module used by python to support regular related operations Fullmatch (regular expression, string) - judge whether the regular expression exactly ma ...

Posted by khalidorama on Sun, 02 Jan 2022 11:39:58 +0100

Timer class principle analysis, task execution delay

API The Timer class is used to delay the execution of a task. schedule(TimerTask task, **long **delay) to specify the delay timeSchedule (TimerTask, date time), specify the timeschedule(TimerTask task, **long **delay, **long **period), specify the delay time and repetition periodSchedule (TimerTask task, date, firsttime, * * long * * period), ...

Posted by mazen on Sun, 02 Jan 2022 11:06:57 +0100

Interviewer: how to play with SpringBoot unified interface return and global exception handling?

At present, most company project frameworks basically belong to the front-end and back-end separation mode. This mode will involve a front-end and back-end docking problem. It is very necessary to maintain a complete and standardized interface for front-end or back-end services, which can not only improve the docking efficiency, but also make m ...

Posted by wsantos on Sun, 02 Jan 2022 06:01:26 +0100

Java entry class, encapsulation, inheritance

Class: What are class members Member methods and member variables decorated with static are called class members Member variables decorated with static are called class variables Member methods decorated with static are called class methods What are instance variables Member methods and member variables that are not decorated with static are ...

Posted by bing_crosby on Sun, 02 Jan 2022 05:03:05 +0100

Example of generalization error parameter adjustment of random forest application in machine learning sklearn classroom of vegetables

from sklearn.model_selection import train_test_split #Divide 30% of the data as the test set Xtrain, Xtest, Ytrain, Ytest = train_test_split(wine.data, wine.target, test_size=0.3) clf = DecisionTreeClassifier(random_state=0) #Modeling: Decision Tree rfc = RandomForestClassifier(random_state=0) #Modeling: random forest clf = clf.fit( ...

Posted by fredted40x on Sun, 02 Jan 2022 04:26:43 +0100

How to quickly and easily add notes to methods?

In the development process, you need to add comments to classes and methods. Class comments are easy to implement. By setting a template, you can automatically create preset comments during creation. Adding comments to methods is not so easy. The main impact is on the processing of parameters. For IDEA, after entering / * * + enter above t ...

Posted by wispas on Sun, 02 Jan 2022 00:40:50 +0100

Java interview often ask knowledge, understand the sorting algorithm at one time, and summarize the commonly used sorting algorithms

realization public class SelectionSort { public int[] selectionSort(int[] A, int n) { //Record minimum subscript value int min=0; for(int i=0; i<A.length-1;i++){ min = i; //Find the minimum value after the beginning of subscript i for(int j=i+1;j<A.length;j++){ ...

Posted by mikew2 on Sat, 01 Jan 2022 18:42:32 +0100

python learning records - List

list 1. What list A list is a collection used to store different data. 2. Create a list Wrap all the elements to be placed in the list, separated by commas. [1,2,3,4,5] [1,2,3,4,5,'ukd'] The above two are lists, but they are not named, so they cannot be called. We can name the list like this. i = [1,2,3,4,5,'ukd'] print(i) output: L ...

Posted by fr34k2oo4 on Sat, 01 Jan 2022 15:31:42 +0100