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catalogue Process and thread Multi process os.fork (a fork system call provided by Unix/Linux operating system) multiprocessing (multi process module of cross platform version) Pool  Subprocess Interprocess communication Multithreading (data sharing) threading.Thread Lock Multi core CPU (due to the existence of Gil lock, cpython mu ...

Hello, I'm glacier~~ Recently, many friends asked me: Glacier, how do you feel you can do anything? Java, Python, big data, distribution, microservices, system architecture, operation and maintenance, penetration, how do you usually learn? I: personally, I think the best way to learn is to summarize problems in the usual work process, pay atte ...

Why write this software Friends engaged in measurement work often use the method of forward rendezvous for measurement, and the later data processing of forward rendezvous will involve complex calculation formulas, which is cumbersome, laborious and error prone. Why not write a user-oriented "fool" software in half an hour? The firs ...

To use this example, you need to go through the docker container. Please drop down first docker image of jxTMS Start the tms container according to the instructions and helloWorld Start trying. Query of jxTMS In the previous section, we demonstrated the definition and ORM operation of tables in the database. In this section, we mainly demonst ...

Raw data set python code Edit with Jupiter notebook import pandas as pd import matplotlib.pyplot as plt plt.rcParams['font.sans-serif']=['SimHei'] data = pd.read_excel(r'E:\a business\Data center station\E-commerce cases\Download source data\order.xlsx') data.info() data.sample(10) Operation results: It can be seen from the observation ...

Introduction to hashlib Cryptography is a huge field. Generally speaking, encryption methods in this field can be divided into two categories: Symmetric encryption: the content can be inversely solved through the encrypted valueAsymmetric encryption: the content cannot be inversely solved through the encrypted value The hashlib module introd ...

2.4.2 date & time component (I) Introduction to this section: This section brings you several controls for displaying time provided by Android. They are TextClock, AnalogClock and chrome. In addition, there is an outdated digital clock, so I won't explain it! OK, let's start this section! 1. Textclock TextClock is a control intro ...

Why use coprocessing? We usually use multithreading or multiprocessing for concurrent programming in Python. For computational tasks, we usually use multiprocessing due to the existence of GIL, while for IO tasks, we can use thread scheduling to make the line give up GIL when executing IO tasks, so as to achieve apparent concurrency. Coprocess ...

Today, I share a practical skill to use Python to read ID card information in batches and write it into Excel. read Taking the ID card in the form of picture as an example, we use Baidu character recognition OCR to read information. Baidu interface provides a free quota, which is almost enough for daily use. Let's take a specific look at ho ...

Test questions: 0. From Python 2 After 2, classes and types are unified by converting BIF S such as int(), float(), str(), list(), tuple() into factory functions. What is the principle of the so-called factory function? A: the factory function is actually a class object. When you call them, you actually create a corresponding instance object. ...