What is Django - Practice Questions & Exercises

Challenge - 5 Problems

🧠 Conceptual

intermediate

What is Django primarily used for?

Django is a popular framework. What is its main purpose?

A Creating mobile apps for Android and iOS

B Managing databases without any code

C Designing desktop software interfaces

D Building websites and web applications quickly and securely

💡 Hint

Think about what Django helps developers do on the web.

Django is a web framework that helps build websites and web apps fast and safely.

❓ component_behavior

intermediate

What does Django's ORM do?

Django has a feature called ORM. What does it do?

A It manages user sessions and cookies automatically

B It styles HTML pages with CSS automatically

C It helps convert database data into Python objects and vice versa

D It compiles Python code into machine code

💡 Hint

Think about how Django talks to databases.

Django's ORM lets you work with database data using Python code instead of SQL.

📝 Syntax

advanced

What is the correct way to define a Django model field for a text column?

Which option correctly defines a text field in a Django model?

Django

from django.db import models

class Article(models.Model):
    content = ???

A models.CharField(max_length=1000)

B models.TextField()

C models.IntegerField()

D models.DateTimeField()

💡 Hint

TextField is used for large text, CharField for short strings.

TextField stores large text data, suitable for article content.

❓ lifecycle

advanced

When is Django's middleware called during a request?

At what point does Django middleware process a web request?

A Before the view function runs and after the response is created

B Only after the response is sent to the browser

C Only when the server starts up

D Only during database migrations

💡 Hint

Middleware wraps around the request and response process.

Middleware runs code before the view handles the request and after the response is made.

🔧 Debug

expert

What error occurs if you forget to add a Django app to INSTALLED_APPS?

You created a new app but forgot to add it to INSTALLED_APPS. What error will Django raise when you try to run migrations?

A django.core.exceptions.AppRegistryNotReady

B django.db.utils.OperationalError

C ModuleNotFoundError

D ValueError: Missing migration files

💡 Hint

Think about what happens if Django can't find the app's models.

If an app is not in INSTALLED_APPS, Django's app registry is not ready to use its models, causing this error.

Practice

1. What is Django primarily used for?

easy

A. Creating desktop software

B. Designing mobile apps

C. Building websites quickly and safely

D. Managing hardware devices

Solution

1. Step 1: Understand Django's purpose

   Django is a framework designed to help build websites efficiently and securely.

2. Step 2: Compare options with Django's use

   Only building websites matches Django's main function; others are unrelated.

3. Final Answer:

   Building websites quickly and safely -> Option C

4. Quick Check:

   Django use = Building websites [OK]

Hint: Remember Django is a web framework, not app or hardware tool [OK]

Common Mistakes:

• Confusing Django with mobile app frameworks
• Thinking Django manages hardware
• Assuming Django is for desktop apps

2. Which of the following is the correct way to start a new Django project in the command line?

easy

A. django startproject mysite

B. django createproject mysite

C. startproject django mysite

D. django-admin startproject mysite

Solution

1. Step 1: Recall Django project creation command

   The official command to start a project is 'django-admin startproject projectname'.

2. Step 2: Match options to correct syntax

   Only django-admin startproject mysite matches the exact command syntax.

3. Final Answer:

   django-admin startproject mysite -> Option D

4. Quick Check:

   Correct command = django-admin startproject [OK]

Hint: Use 'django-admin startproject' to create projects [OK]

Common Mistakes:

• Using 'django startproject' instead of 'django-admin'
• Mixing command order
• Using 'createproject' which is invalid

3. What will the following Django code snippet do?

from django.http import HttpResponse

def home(request):
    return HttpResponse('Hello, Django!')

medium

A. Display 'Hello, Django!' on the webpage

B. Cause a syntax error

C. Return a JSON response

D. Redirect to another page

Solution

1. Step 1: Analyze the function's return value

   The function returns an HttpResponse with the text 'Hello, Django!'.

2. Step 2: Understand HttpResponse behavior

   HttpResponse sends plain text to the browser, so the page will show that text.

3. Final Answer:

   Display 'Hello, Django!' on the webpage -> Option A

4. Quick Check:

   HttpResponse returns text = Display text [OK]

Hint: HttpResponse sends text to browser as webpage content [OK]

Common Mistakes:

• Thinking it returns JSON instead of plain text
• Assuming it causes an error
• Confusing HttpResponse with redirect

4. Identify the error in this Django view code:

from django.http import HttpResponse

def greet(request):
    return HttpResponse('Welcome to Django!')
    print('Greet function called')

medium

A. HttpResponse is not imported correctly

B. The print statement is unreachable after return

C. Function name should be capitalized

D. Missing parentheses in HttpResponse

Solution

1. Step 1: Check code flow after return

   Code after a return statement in a function is never executed.

2. Step 2: Identify unreachable code

   The print statement comes after return, so it will never run.

3. Final Answer:

   The print statement is unreachable after return -> Option B

4. Quick Check:

   Code after return = Unreachable [OK]

Hint: Code after return in function won't run [OK]

Common Mistakes:

• Thinking print runs before return
• Assuming import error without cause
• Believing function names must be capitalized

5. You want to create a simple Django app that shows a list of items stored in a database. Which Django feature helps you manage the data easily?

hard

A. Django ORM (Object-Relational Mapping)

B. Django Templates

C. Django Middleware

D. Django Admin site

Solution

1. Step 1: Understand the task

   Managing data in a database means working with models and queries.

2. Step 2: Identify Django feature for data management

   Django ORM lets you create, read, update, and delete database records using Python code.

3. Final Answer:

   Django ORM (Object-Relational Mapping) -> Option A

4. Quick Check:

   Data management = Django ORM [OK]

Hint: Use ORM to handle database data easily in Django [OK]

Common Mistakes:

• Confusing templates with data management
• Thinking middleware manages data
• Assuming admin site is for data handling only