The difference between computed and methods in Vue

Vue in computed It can be used for simple splicing of data to be displayed computed and methods The task of splicing and displaying data can also be completed with methods, but when the data of the page changes, the methods in methods will be called again (causing unnecessary performance consumption), while the methods in ...

Posted on Sun, 05 Apr 2020 14:00:20 -0400 by Kadanis

python notes: make weekly report, price adjustment analysis, average unit price, number of sheets and proportion according to purchase order and price adjustment table

Today, I'm going to share with you the theme of weekly newspaper. I believe that for those who spend half a day on weekly newspaper, it's really a painful thing to do. With this tool, we will be much easier. First, the source table we export is the purchase order and price adjustment table. Then according to these two tables, we can make a wee ...

Posted on Sun, 05 Apr 2020 12:05:08 -0400 by auamy

Visual decision tree in Python [Matplotlib/Graphviz]

Decision tree is a popular supervised learning method. The advantage of decision tree is that it can be used not only for regression, but also for classification. It does not need feature scaling, and it has better interpretability and is easy to visualize decision tree. Visual decision tree is not only a good way to understand your model, but ...

Posted on Sun, 05 Apr 2020 11:55:48 -0400 by hackerkts

Python object oriented -- Basic inheritance

1. Basic inheritance diagram 1.1 instantiate the object c of a Contact class 1.2 instantiate an object s of Supplier class 1.3 properties of access object 1.4 method of accessing object s 1.5 variable details If you define c.all_contacts = "xxxxx"; from the new definition, Object C has a new property all_contacts with a value of ...

Posted on Sun, 05 Apr 2020 11:38:26 -0400 by IcedEarth

Python 3 Chinese word cloud production

Two Python libraries needed in this article jieba: a Chinese word segmentation tool Wordcloud: a word cloud generation tool in Python The source of the article is 309 articles from Han Han's Sina blog Python 3 crawler Han Han Sina blog post Python + worldcloud + jieba learn to generate word cloud with any Chinese t ...

Posted on Sun, 05 Apr 2020 07:34:06 -0400 by billiondevil

Thrift -- communication between NodeJS and Java

Thrift – realize the communication between NodeJS and Java Apache Thrift is an efficient framework implemented by Facebook that supports remote service calls in multiple programming languages. It uses interface description language to define and create services, supports extensible cross language service deve ...

Posted on Sun, 05 Apr 2020 04:41:42 -0400 by mlin

Third party login in Django

What is OAuth2.0 The English full name of OAuth is Open Authorization, which is an Open Authorization protocol. There are two versions of OAuth at present. Version 1.0 in December 2007 (with a later revision of 1.0a) and version 2.0 in April 2010 have serious security vulnerabilities. Version 2.0 solves this problem. OAuth is simply a kind of a ...

Posted on Sun, 05 Apr 2020 02:44:10 -0400 by e7gaskell

Python learning notes (8) Python list (3)

sequence Sequence: mathematically, a sequence is an object (or event) that is arranged in a column; thus, each element is either before or after another element. The order between elements is very important here. Wikipedia Sequence is the most basic data structure in Python. Each element in the sequence is assigned a number - its location, or i ...

Posted on Sun, 05 Apr 2020 02:11:40 -0400 by wrapper

Python implementation and simple application of BP algorithm

First, we use Python to implement a simple neural network algorithm: import numpy as np # Definition tanh function def tanh(x): return np.tanh(x) # tanh Derivative of function def tan_deriv(x): return 1.0 - np.tanh(x) * np.tan(x) # sigmoid function def logistic(x): return 1 / (1 + np.exp(-x)) # sigmoid Derivative of functio ...

Posted on Sun, 05 Apr 2020 00:51:18 -0400 by vipul73

python basic training question 2-tuple, dictionary

1. The judgment value is in the tuple >>> a = ( 1, 2, 3, 4, 10 ) >>> 10 in a True >>> '10' in a False 2. Modify the value in the tuple. Since the tuple cannot be modified directly, you can first convert it to a list, and then assign it to a new tuple object after the list is modified >>> a = ( 1 ...

Posted on Sat, 04 Apr 2020 22:50:17 -0400 by s_shrum