Tag：Press
-
Experiment 2
1 # basic operation exercises: list and list derivation, formatting and type conversion 2 x = list(range(10)) 3 print (‘integer output 1:, end = ”) 4 for i in x: 5 print(i, end=’ ‘) 6 print (‘\ n integer output 2:’, end = ”) 7 for i in x: 8 print (f ‘{I: 02D}’, […]
-
Translated book “Practical Guide to the Internet of things” published | new achievements: translating your own English Introduction
This book has a long story, and today it has come to an intended ending. It has been two years since the book was reviewed, published in English and translated into Chinese. This is a memorable book. The English title is “learning Internet of things”, and the Chinese title is “Practical Guide to the Internet […]
-
What is the reason why the keyboard cannot press the G key after holding down the a + W key
A friend asked me a few days ago that when he was playing a game, he didn’t respond by pressing G after pressing a + W. Should be playing games, WASD is the direction, and then press and hold the direction key, and then press other keys to do other actions. After testing, I found […]
-
Linux Cluster pressure measurement deployment scheme
What we share today is mainly explained from three aspects. Cluster press deployment Introduction to shell script Shell script completes the press deployment Cluster press deployment linux.png Background introduction of distributed pressure measurement In the actual combat of the enterprise project, if the processing capacity of the pressed server is very high, or the pressed […]
-
Python crawls Dangdang book data and visually displays the data
development environment Python 3.8 Pycham 2021.2 Professional Edition Module use The CSV module saves the data climbed down to the built-in module in the table Requests > > > PIP install requests data request module Parse > > > PIP install parse data parsing module CSS selector to extract data Students who have questions about […]
-
The react buffer found in the system ypescript/ a>
Why? Special €/ h2> What is the power of the tank? React component/ li> Using typescript, you can provide the adjusted type of fixed files/ li> This is the hospital support/ li> For the assembly, set the pressure/ li> What’s wrong? API and scope/ li> Raccoon Н “80 KB”/ li> SupportHLSWhat? Code >. M3u8 (all, […]
-
The JSON string is output to a file in a standard format for friendly display
1. Use Ali’s fastjason 1.1 project pom.xml dependency <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.58</version> </dependency> public static void main(String[] args) { String jsonString = “{\”_index\”:\”book_shop\”,\”_type\”:\”it_book\”,\”_id\”:\”1\”,\”_score\”:1.0,” + “\”_ Source \ “: {\” name \ “: \” Java programming ideas (4th Edition) \ “, \” author \ “: \” [US] Bruce Eckel \ “, \” category \ “: \” […]
-
Django – Introduction to fields and field parameters of model layer, single table addition, single table query
1Introduction to fields and field parameters class Book(models.Model): #If you don’t write an ID, it will default to an ID and add it automatically #primary_ Key = true indicates that the field is a primary key, and only one primary key can be used in a table # id = models.AutoField(primary_key=True) #Varchar type, length, #Field […]
-
Django — model creation of multi table operation, one to many add records, many to many add, modify, delete records, many to many other APIs
1Model creation of multi table operation 1. Book list, author list, author detail list, publishing list, (the third intermediate table) 2. Author and author details: it’s one-to-one. You can write the associated field on either side Books and publishers: one to many. Once the one to many relationship is established, the related fields are written […]
-
Django — multi table operation: object based cross table query (forward and backward query), cross table query based on double underline, advanced continuous cross table query
1、 Object based cross table query (forward and backward query) #There are two ways to query across tables -Object based cross table query: subquery -Cross table query based on double underscores: association query, join table query #Object based cross table query -Query the city of the book publishing house whose primary key is 1 #Object […]
-
How to publish a technical book
Many people want to write a book and summarize it as a stage of their career. However, the standard of publishing a paper book is usually very high, the process is very long, and the material return may be very low. If there is no deep feelings, extraordinary will, or improper method, it is easy […]
-
New achievements: translation of my own English Introduction
There is a long story in this book, and today it is the end of a dream. It has been two years since the book was reviewed, published in English and translated into Chinese. This is a memorable book. The English title of the book is learning Internet of things, and the Chinese title of […]