Classification of sets:
List: the stored objects are orderly (the order of the elements is the same as the order of adding) and can be repeated
ArrayList: the underlying data structure is array. The thre ...
Posted on Sat, 15 Feb 2020 10:47:56 -0800 by amo
The following is a list of common relationship definition template codes used in relational databases
One to many
Users and their posts (user table and post table)
Roles and users belonging to this role (role table and multi-user table)
__tablename__ = 'roles'
Posted on Sat, 15 Feb 2020 08:00:50 -0800 by JonathanV
From learning single-chip computer and C language to learning CV and Python, I got a lot of help in CSDN, Jianshu, blog Park and github, so I also want to share some of my own small things to you, hoping to help others. mark, the first blog to record life.
2, Image detection steps
1. Read two pictures
The first one is the small objec ...
Posted on Sat, 15 Feb 2020 05:54:52 -0800 by philicious
Passed Previous article Inspired by the blog, if we want to achieve Baidu translation, we need to find out where the value of sign comes from, move a small bench, and start a tutorial!
After the translation results come out, we open the developer tool (or press F12), then press "Ctr ...
Posted on Sat, 15 Feb 2020 00:08:50 -0800 by melittle
1. Getting started with Python
1.1 Setting up environment
Set up python environment on mac system.
The role of environment variables: to facilitate the execution of executable programs on the command line (terminal), add the directory where the executable programs are located to the environment variable ...
Posted on Fri, 14 Feb 2020 08:53:33 -0800 by vidyashankara
This article mainly introduces the method of image processing using TensorFlow. The editor thinks it's very good. Now I'll share it with you and give you a reference. Let's follow Xiaobian to have a look
1, Zooming in and out of pictures
2, Brightness adjustment of pictures
3, Contr ...
Posted on Fri, 14 Feb 2020 06:51:22 -0800 by patrick99e99
Today, February 14, 2020, overcast to light rain, 11-17 ℃
Single dogs can't celebrate Valentine's day, so happy birthday to ENIAC, 74 A kind of
1, Condition test
A conditional test is an expression with a value of True or False. An expression can be a variable of type bool or a comparison expression ...
Posted on Fri, 14 Feb 2020 00:43:40 -0800 by mr_zhang
1. Demand analysis
The login interface shall meet the following requirements:
The system has two options: login and registration
The system should be able to realize the login error prompt, such as the account password error, etc., and the user information should be saved in the user_info.txt folder
The system shall be able to count the number ...
Posted on Thu, 13 Feb 2020 11:11:12 -0800 by dare87
Judge whether it is OK iteration
1. In python, traversing lists, tuples, dictionaries, etc. through the for loop is Iteration
Example 1: traversal list
num = [11, 22, 33, 44, 55]
for x in num:
The results are:
Example 2: traversal string
for x in 'abcdef':
Posted on Thu, 13 Feb 2020 05:41:48 -0800 by pckidcomplainer
2. Some of the concepts we must know about Crawlers
2.1 Definition of a crawl
2.2 Legal risk of Crawlers
2.3 Understanding crawl types from crawl scenarios
2.4 Basic techniques and crawl framework for Crawlers
3. Data Grabbing Technology
3.1 Tencent NPC epidemic data d ...
Posted on Wed, 12 Feb 2020 18:00:13 -0800 by jumphopper