How to Develop a Web Application with Python?

Introduction

You need to understand before we start with how to develop a particular web application with Python.

The internet is essentially a network of different computers. The goal is to allow communication between these computers. A network consists of nodes and edges. For communication, it is necessary to have a medium by which different messages reach to the intended destinations. One way to go through the internet is TCP/IP. The TCP makes sure that the messages are delivered safely without anything missing. Each computer has a particular IP which is its unique address.

Response/Request Cycle and HTTP

In order to communicate with effectiveness, the different elements of the network need to agree on one particular protocol. Many computers which are on the internet essentially use HTTP in order to communicate. Whenever you click on a particular link or simply type a given URL into the browser, you are essentially making an HTTP GET request.

Client-Server Architecture

In case of software development, an architecture is actually a way to organize the code which you see at different times. It is also known as the pattern. A browser is a typical example of a client. It essentially sends an HTTP request to the server. The server returns a particular HTTP response that the browser renders as a given web page.

Databases

Data has to be stored somewhere. We have to save the data in different files. Databases are another method of saving the data which does have different advantages. Web applications generally save the data in different databases instead of files.

Exercise

Using Google Chrome, first, open the developer tools- the view/Developer/DeveloperTools

A particular tab will come up. Click on the tab named Network and then type the URL which is familiar to you. Now see the HTTP GET request.

Note that you will have the information in the curl. It is essentially presented in a much more user-friendly way. Explore any of your favourite websites utilizing the developer tools in order to inspect what is exactly going at the HTTP network level.

Setup

First, you need to create web services. Make a project folder. Now create a project directory. After this install Django. pip is the method to install any Python code.Python code is essentially installed as a particular package. To list all the presently installed packages of Python, use $ pip freeze. In order to install Django, use $ pip install django. This allows Django web development.

Creation of Django Project

Now use the script which is supplied to set up a particularly new project. Use $ django-admin.py startproject website.

It will allow you to see the folder structure as well as files generated. The most important files are urls.py and manage.py.settings.py.

settings.py

A significant configuration is required to set up a particular web application. The website/settings.py consists of a large number of names which define all of the configurations for the website. All the defaults are now fine. You should note that INSTALLED_APPS name is actually defined as a strings’ tuple. You will be adding to the tuple. Note that DATABASES name is particularly defined as a dictionary.

Creation of the Database

The current directory doesn’t consist of db.sqlite3 file. Like other web frameworks, Django stores all of its data in a particular database. Create a database using python manage.py syndb.

Now the topmost level website which contains the file called db.sqlite3 is your database.

Inspection of the Database

Select the sqlite-shell-win32-x86-....zip file. Now unzip it by means of double-clicking it. After this, drag and drop it into the address C:BOOTCAMPPython34. The very last step is its addition to a directory on the given path.

A database application is essentially like a server. One sends requests utilizing clients. The clients in this particular case aren’t browsers but programs like the Python website.

You will now use another server in order to inspect the database, independently. You will launch the particular client by means of typing sqlite3 db.sqlite3.

Run the Server

You have to run the server with the command ./manage.py runswever.

Now you can easily send http requests utilizing the browser as a client. You can also quit the server at any desired point by pressing ctrl + c.

Creation and Installation the App

Like any framework, Django offers a way to organize the code. It offers a well-proven architecture which you learn in order to work within. Python web development with Django is quite easy.

A great web framework makes quite a lot of decisions for you. You need to build on the combined experience of different developers that have created it. Django introduces a particular concept of an app as a method to organize the code. The blog will be the app. You need to create it with the ./manage.py startapp blog.

We have to the website about the existence of blog apps. You can essentially achieve this by means of adding it to the particular INSTALLED_APPS tuple.

Creation of Web Services

You need to program the server in order to return a response to a particular HTTP GET request. You will require:

•   Map a URL to a particular view function

•   And also define the view function

Now comes the website/urls.py

This particular file matches URLs to different view functions. Whenever the Django server receives a particular URL, it then searches in this particular file for one which matches. In case it matches, it then executes the particular mapped function. In case it isn’t able to find anything, you will receive a 404 Page Not Found error.

GET Parameters

The different HTTP GET requests can pass different parameters in the URL. The parameter section is essentially defined by ? which followed by &- that are separated keys and values.

Conclusion

Django is the best python framework for web development. It offers multiple advantages and features. With the use of right practices, you can easily create a web application using Django. These apps are featured with different unique and robust functionalities that make it easier for the users. These apps are user-friendly and the ease of use is high.

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