Create web applications using Python and Django

Python and Django are one of the best tools for creating great web applications. Python is a general-purpose programming language with easy-to-learn, beautiful syntax, and powerful library support. Django is one of the Python web frameworks with easy development, powerful data management, and many built-in features.

In this article, we will discuss how to create a web application using Python and Django. We'll use a basic web application to demonstrate how to build a complete application with explanations.

1. Install Python and Django

First, we need to install Python and Django. You can download the latest Python version from the Python official website, and the installation process is very simple. Once the installation is complete, we can install Django using pip (Python package manager). Enter the following command at the command line:

pip install django

If you are running this on Linux or Mac, you will need to preface the command with sudo.

2. Creating a Django Project

Now that we have Python and Django installed, we can create a basic Django project on the command line using:

django-admin startproject myproj

Here, myproj is the name of our project. We can change it to any name, but it is best not to use Chinese characters or spaces.

In our project folder we will see a new folder called myproj which contains some files and folders.

We can now start the Django development server using the following command:

cd myproj
python manage.py runserver

Enter localhost:8000 in the browser and you will see Django’s welcome page.

3. Creating a Django Application

Now that we have created our Django project, we need to add our web application. To do this, we will create a new application called "myapp" using the following command:

python manage.py startapp myapp

In our project folder, we will see a new "myapp" folder. It contains some files and folders, including our application code.

4. Writing Application Code

Now, we can start writing our application code. In the "myapp" folder we will create a new file called "views.py". This file will contain our application logic code.

from django.http import HttpResponse

def index(request):
    return HttpResponse("Hello, world!")

Here, we define a function called "index". It receives a parameter named "request" and returns an HttpResponse object containing the string "Hello, world!"

Next, in the "myapp" folder, we create a new file called "urls.py". This file will contain our application URL matching code.

from django.urls import path

from . import views

urlpatterns = [
    path('', views.index, name='index'),
]

Here we define a list called "urlpatterns" and set it to an instance called "path". This example takes an empty string (' ') as the first argument and the "index" function we created earlier as the second argument.

We also need to connect the application’s URL to our Django project. To do this, find the file named "urls.py" in the project folder (not the one we created before) and modify it as follows:

from django.contrib import admin
from django.urls import include, path

urlpatterns = [
    path('admin/', admin.site.urls),
    path('myapp/', include('myapp.urls')),
]

Here, we have defined two URLs. One is the URL for the admin site ("/admin/"), while the other is the URL we defined earlier in "myapp/urls.py".

5. Running the Application

Now we can run our application. Start the Django development server using the following command:

python manage.py runserver

Visit "localhost:8000/myapp/" in the browser, you will see the "Hello, world!" message.

6. Conclusion

In this article, we discussed how to create a web application using Python and Django. We created a basic web application while explaining the code. Along the way, we've covered how to install Python and Django, how to create Django projects and applications, and how to write and run code.

Now that you know how to create web applications using Python and Django, start trying to create your own!

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