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The aggregate functions in the orm model are consistent with those in MySQL, including Sum, Avg, Count, Max and Min. let's introduce them one by one
All aggregate functions are placed in Django db. Under models. And the aggregate function cannot be executed alone. The aggreg ...
Interrupt threadThread of thread Interrupt () method is to interrupt a thread. It will set the interrupt status bit of the thread, that is, set it to true. Whether the thread dies as a result of the interrupt, waits for a new task, or continues to run to the next step depends on the program itself. The thread will detect this interrupt flag bit ...
Absrtact: event driven is a common code model. It usually has a main loop that continuously receives events from the queue and then distributes them to the corresponding functions / modules for processing. Common software using event driven model includes graphical user interface (GUI), embedded device software, network server and so on.
Posted by a6000000 on Wed, 09 Feb 2022 15:45:37 +0100
This article is only for my study notes and is deleted
The title comes from https://github.com/nndl/nndl.github.io
array operation of numpy
1. Import numpy Library
import numpy as np
2. Create a one-dimensional array A and initialize it to [4,5,6], (1) output the type of a, (2) output the size of each dimension of a, (3) ...
Posted by lbraine on Wed, 09 Feb 2022 15:41:34 +0100
1. What is ssl
Secure Sockets Layer
It is a standard that supports secure communication on the Internet, and integrates data encryption technology into the protocol.
Data is encrypted before leaving the computer and is decrypted only after it reaches its intended target.
Certificates and cryptographic algorithms support all this. Use OpenSS ...
Posted by b-ware on Wed, 09 Feb 2022 15:23:38 +0100
Experiment 33 of operating system truth restoration experiment record: realizing system call wait and exit
1.wait, exit, orphan process, zombie process
exit is called by the subprocess. On the surface, its function is to make the subprocess finish running and pass the return value to the kernel. In essence, the kernel recovers all resources o ...
Posted by barbgd on Wed, 09 Feb 2022 14:56:03 +0100
Relevant game materials (pictures and audio, etc.) come from the network and are subject to invasion and deletion.
Small partners who need source code can add QQ group: 773162165
Python version: 3.7.4 Related modules: pygame module; And some python built-in modules.
Install Pyth ...
Posted by GrexP on Wed, 09 Feb 2022 14:43:57 +0100
Basic exception handling syntax and procedures
The error handling mechanism in Java refers to non compiled errors, that is, non syntax errors. Similar to the division by zero error, that is, you can't divide by 0 during division. Java will encounter the following errors: example: system out. println(16 / 0);
The ArithmeticException here is ...
Posted by nihal on Wed, 09 Feb 2022 14:36:26 +0100
1. Basic introduction
The strategy pattern defines the algorithm family and encapsulates them separately so that they can replace each other. This pattern makes the change of the algorithm independent of the customers using the algorithm.This model embodies several design principles:
Opening and closing principle: separat ...
Posted by pozer69 on Wed, 09 Feb 2022 14:33:58 +0100
Originally written by binder
When it comes to binder, many people should say how old the technology of binder is, and there are a lot of articles analyzing binder. You don't need to write articles about binder at all! In fact, I don't agree with this view. Tell me my reasons:
You need to summarize the binder knowledge you have read and learne ...
Posted by rsilvs on Wed, 09 Feb 2022 14:31:53 +0100