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Python Django Interview Questions

A complete guide to learning and building projects with Python & Django — the powerful backend framework trusted by developers for creating dynamic, secure, and scalable web applications. From setup to deployment, master Django Models, Views, Templates, REST API, and authentication systems.

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Django's static files handling involves serving CSS, JavaScript, images, and other files that do not change dynamically. Proper management of static files is crucial for web applications.

To manage static files in Django, follow these steps:

  1. Set the STATIC_URL and STATICFILES_DIRS in your settings.py.
  2. Use the {% load static %} template tag to include static files in your templates.

Here’s how you can set it up:

STATIC_URL = '/static/'
STATICFILES_DIRS = [os.path.join(BASE_DIR, 'static'),]

And to include a CSS file in a template:

{% load static %}
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Pagination in Django allows you to divide a large set of data into manageable pages. This improves the user experience by preventing information overload.

To implement pagination, follow these steps:

  1. Import Paginator and Page from django.core.paginator.
  2. Pass your queryset to the Paginator and specify the number of items per page.
  3. Get the current page number from the request and retrieve the corresponding page.

Here’s an example:

from django.core.paginator import Paginator

def my_view(request):
    object_list = MyModel.objects.all()
    paginator = Paginator(object_list, 10)  # Show 10 items per page
    page_number = request.GET.get('page')
    page_obj = paginator.get_page(page_number)
    return render(request, 'my_template.html', {'page_obj': page_obj})

In your template, you can iterate over page_obj to display items and add pagination controls.

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Django signals are a way to allow decoupled applications to get notified when certain actions occur elsewhere in the application. This is useful for executing actions in response to events.

To use signals, follow these steps:

  1. Import the necessary modules from django.dispatch.
  2. Define a signal receiver function that performs the desired action.
  3. Connect the receiver to the signal using signals.connect().

Here’s an example of a signal that sends an email when a user is created:

from django.db.models.signals import post_save
from django.dispatch import receiver
from django.contrib.auth.models import User

@receiver(post_save, sender=User)
def send_welcome_email(sender, instance, created, **kwargs):
    if created:
        # Logic to send email
        print(f'Welcome {instance.username}!')

With this setup, the send_welcome_email function is called automatically whenever a new user is created.

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