1. File operation
Find the file location
Do some work
r-read (read) w-write (write) a-addition
rd -- read byte wd -- empty write, write section ad -- add write (byte)
r+ -- Read and Write w+ -- Write and Read a+ -- Additional Reading
open(): Open. Open controls the operating system through python to open files.
Posted on Wed, 28 Aug 2019 21:47:41 -0700 by mevasquez
Author: Hello GitHub - Dream chaser
The sample code involved in this article has been synchronously updated to HelloGitHub-Team repository
The model for blog posts has an excerpt field, which stores a summary of the posts.Until now, you can only manually enter summaries for articles in the django admin background.Each time you enter a summary ...
Posted on Wed, 28 Aug 2019 19:11:10 -0700 by anhedonia
Posted on Wed, 28 Aug 2019 18:47:53 -0700 by tommy445
python clustering algorithm solution (rest interface / mpp database / json data / download pictures and data) 1. scene descriptionHas been doing java, because of project reasons, need to encapsulate some classical algorithms to the platform, while learning python, while looking for classical algorithm code online. Today, introduce the classical ...
Posted on Tue, 27 Aug 2019 21:33:34 -0700 by eskimowned
Tag selector object
HtmlXPathSelector() creates a tag selector object with parameters that receive html objects called back by responseNeed to import module: from scrapy.selector import HtmlXPathSelector
The select() tag selector method is a method in the HtmlXPathSelector. The parameter receives the selector rule and the return list element i ...
Posted on Mon, 26 Aug 2019 20:17:23 -0700 by peaforabrain
In the previous article, "Deep into argparse (1)", we explored the basic functions of argparse, including parameter actions and parameter categories, and developed the ability to write a simple command line program.This article will continue to gain insight into the advanced gameplay of argparse, ...
Posted on Mon, 26 Aug 2019 19:37:44 -0700 by tarleton
Model Class Relationships
1) One-to-many relationshipExample: Books - Heroes models.ForeignKey() is defined in multiple classes.
2) Many-to-many relationshipExample: News-News Type Sports News International Newsmodels.ManyToManyField() can be defined in any class.
3) One-to-one relationshipExample: Employee Basic Information Class - Employee ...
Posted on Sun, 25 Aug 2019 19:41:47 -0700 by Fazer
Foreword: What does the django namespace solve?
It is possible to have a url with the same name among multiple apps, so avoid confusion when reversing the url and use the application namespace to distinguish between them.Apply namespace usage.Define app_name in the application url
An app can create multiple URLs that are mapped to one app, ...
Posted on Sun, 25 Aug 2019 11:35:11 -0700 by yuan
About me A thoughtful programmer ape, a lifelong learning practitioner, currently works as a team lead er in an entrepreneurship team. The technology stack involves Android, Python, Java and Go, which is also the main technology stack of our team. Github: https://github.com/hylinux1024 Wechat Public Number: Angrycode
In the previous art ...
Posted on Sat, 24 Aug 2019 00:15:49 -0700 by phpflixnewbie
Mapping allows you to identify elements using any immutable object (most commonly strings and tuples). Dictionary is the only built-in mapping type in Python. In a dictionary, keys must be unique. You can use the function dict to create a dictionary ...
Posted on Fri, 23 Aug 2019 02:48:49 -0700 by phu