Python Foundation: Math related modules

Catalog 1. introduction 2. math module 3. decimal module 4. random module 1. introduction Let's take a look at the math related modules in Python, as follows: Modular describe math Provides access to mathematical functions defined by the C standard (not applicable to complex numbers) cma ...

Posted on Sun, 26 Jan 2020 22:11:44 -0800 by david4u

Prediction of the cumulative number of confirmed cases of new coronavirus in Wuhan on January 28 using a simple all connected neural network

Code background These days, due to the outbreak of new coronavirus, the number of new confirmed cases every day surprised me to get up in the morning! In order to contribute to the society, we can stay at home and go out less even during the Spring Festival. Major IT enterprises have donated money and ...

Posted on Sun, 26 Jan 2020 21:31:29 -0800 by ollmorris

ComblockEngine Source Analysis 2 - Object Pool and its BUG Existing

Article Directory Say something first What is an object pool Object pool in CBE Hidden BUG BUG Validation BUG Repair Say something first Writing the first CBE Source Blog: Role Account Login and Management When I noticed that the CBE was full of objects such as _g_objPool, it was obvious that it ...

Posted on Sun, 26 Jan 2020 19:48:32 -0800 by vickie

Data structure and algorithm 12 stack and queue loop queue priority queue

Circular queue algorithm without data item count: It should be noted that since it is a circular queue, it is possible that the real pointer and the front pointer point to the same position, but there are many situations that cause the situation of being empty and full, so the data item is one less than the storage space, so this problem can b ...

Posted on Sun, 26 Jan 2020 09:17:39 -0800 by douga

Add, delete, query and modify MySQL tables

Catalog New data Query data Full column query Specify column query Query field is an expression alias Deduplication sort Condition query: WHERE Paging query: LIMIT Modify data Delete data Key summary Around a table, the four most important operations are adding, deleting, querying and ...

Posted on Sun, 26 Jan 2020 05:10:02 -0800 by nelsok

Python_Day01 (Hello and Turtle libraries)

Python_Day01 (Hello and Turtle libraries) Hello world // hello.py print('Hello world!') print('Hello World!') print('Hello','world') print('hello', 'world', sep=', ', end='!') print('goodbye, world', end='!\n') Methods of Turtle Library 1.forward() | fd(): Move a specified distance forward.Paramet ...

Posted on Sat, 25 Jan 2020 22:00:18 -0800 by nuying117

JavaScript drag the mouse to draw the box to achieve selection

I am a novice who just started to learn JavaScript, so I decided to update some interesting or practical common code, learn technology and share with you from time to time. Aiming at the method of JavaScript dragging the mouse to draw the box to achieve the selection, I have checked a lot on the Internet, but I feel that it is ...

Posted on Sat, 25 Jan 2020 07:57:43 -0800 by prent327

[bzoj2683] Simple Question: 3-D Partial Order cdq Dividing

Topic: Given a matrix of n_n n_n(n < 1e5)n < 1e5), single point modification, interval query. Ideas: A two-dimensional tree array?The space is not open. That's another way to remember that when you used cdq division to make a tree array before, the answer to each query was modified in front of it and the location of t ...

Posted on Thu, 23 Jan 2020 09:09:19 -0800 by crunchyfroggie

2020 zero base to rapid development of Vue, quanjiatong, e-commerce management system (element UI) Order Management

Article directory 1, introduction 2. Classification parameters 2.1 rendering order list page by route 2.2 get the order data list by page 2.3 rendering order table table 2.4 realize paging function 2.5 realize the data linkage effect of provincial, urban and county 2.6 display logistics progress dia ...

Posted on Thu, 23 Jan 2020 07:21:03 -0800 by jqa

Daily AC series: sum of three

1 topic LeetCode question 15 , medium difficulty, Title Description: Given a n array of N integers nums, judge whether there are three elements a, b, c in nums, so that a + b + c = 0? Find all triples that meet the conditions and are not repeated. Note: the answer cannot contain duplicate triples. 2 solution Whatever comes first, O(n3): for(in ...

Posted on Thu, 23 Jan 2020 06:42:23 -0800 by gojiita