Dictionary public method

Dictionary public method Dictionary introduction Think about it: If there is a list nameList = ['xiaoZhang', 'xiaoWang', 'xiaoLi']; You need to write the name "xiaoWang" wrong. Modify it by code: nameList[1] = 'xiaoxiaoWang' If the order of the list changes, as follows nameList = ['xiaoW ...

Posted by thepreacher on Sun, 23 Feb 2020 10:01:49 +0100

Fundamentals of Computer Visual Digital Image Processing

Image Processing Basis 1. Software Installation In the computer vision course, image processing is done in the python environment, so you need to select the software that can edit the python statement. The visual interface of PyCharm is selected here. In addition, there are editors such as VScode,Su ...

Posted by wildcolour on Sun, 23 Feb 2020 04:13:37 +0100

Object oriented of PYTHON (basic)

1, Create classes and objects Object-oriented programming is a kind of programming method. The landing of this programming method needs to use "class" and "object". Therefore, object-oriented programming is actually the use of "class" and "object". Class is a te ...

Posted by mattonline on Sat, 22 Feb 2020 12:45:55 +0100

Go golang Foundation--func Function

Function function The Go function does not support nesting, overloading, and default parameters The following features are supported: No prototype required, variable length parameters, multiple return values, named return value parameters, anonymous functions, closures The definition function uses the keyword func and the left curly brace c ...

Posted by Japet on Fri, 21 Feb 2020 17:09:02 +0100

Redis5.x five data types common commands

Pay attention to the official account number: CoderBuff, reply to "redis" and get the complete version of Redis5.x tutorial PDF. Redis5.x tutorial directory Chapter I preparation Chapter II data types Chapter III orders Chapter IV configuration Chapter 5 Java client (I) Chapter VI affairs Chapter 7 distributed lock Chapter 8 Java cli ...

Posted by manx on Fri, 21 Feb 2020 08:27:39 +0100

Python crawler framework scratch getting started the first crawler: using xpath to crawl the start Chinese Web

1, Demand analysis To climb the 24-hour hot list of novels on the start of Chinanet: https://www.qidian.com/rank/hotsales?style=1 As the first crawler, we only crawl the first page of each novel's name, author, type, and whether it is serialized. 2, Create project Open the command line, switch to th ...

Posted by msing on Thu, 20 Feb 2020 07:20:41 +0100

Get object (tag) name, property, content, comment

How to get object (tag) name, attribute, content, comment and other operations by using the Python crawler beautifulsop 1, Tag object 1. The tag object is the same as the tag in the XML or HTML native document. from bs4 import BeautifulSoup soup = BeautifulSoup('<b class="boldest">Extremely bold&l ...

Posted by etoast on Wed, 19 Feb 2020 17:41:47 +0100

Data visualization of Python learning

Common Python packages Matplotlib Seaborn Pandas Bokeh Plotly Vispy Vega gaga-lite Matplotlib visualization Matplotlib installation pip install matplotlib-i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com If you fail, try this: Update pip first and install matplotlib python -m pip ins ...

Posted by swimmerphil1 on Wed, 19 Feb 2020 16:04:51 +0100

Hans 123 breakthrough strategy in days

Preface HANS123 strategy was first used in the foreign exchange market. Its trading mode is relatively simple and belongs to the trend breakthrough system. This trading mode can enter the market at the first time when the trend is formed, so it is favored by many traders. So far, HANS123 has expanded many versions. Today, we will understand HA ...

Posted by Stille on Wed, 19 Feb 2020 11:06:08 +0100

python django project creation steps

There are many different Web frameworks under Python. The common ones are Django, Flask,Torand,. Django is the most representative of the heavyweight players. Many successful websites and apps are based on Django. Django adopts the framework mode of MVC, namely model M, view V and controller C. 1, P ...

Posted by Kookedoh on Tue, 18 Feb 2020 12:59:24 +0100