Java collection defragmentation (1)

Classification of sets: 1.collection interface List interface ArrayList class Vector class LinkedList class Set interface HashSet class TreeSet class 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

Common relationship template codes

The following is a list of common relationship definition template codes used in relational databases One to many Example scenario: Users and their posts (user table and post table) Roles and users belonging to this role (role table and multi-user table) Sample code class Role(db.Model): """Role table""" __tablename__ = 'roles' ...

Posted on Sat, 15 Feb 2020 08:00:50 -0800 by JonathanV

Target detection in Python

I. Preface 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

python translation interface test - Final

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! First step 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

python note 18 (review)

Today's Content Review Detailed Content 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

python's method of image processing with TensorFlow

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 Article directory 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

Python learning journal Day5 if statement

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

python editing user login interface

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

Learning notes -- iteration 1 of classes in Python

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: print(x) The results are: 11 22 33 44 55 Example 2: traversal string for x in 'abcdef': print(x ...

Posted on Thu, 13 Feb 2020 05:41:48 -0800 by pckidcomplainer

Topic of the 2020 Pyton Developer Online Technology Summit: Technology Implementation of the Crawler Framework and Experience Sharing with Module Applications

Article Directory 1. Preface 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