Django project structure walkthrough - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

What is the role of the manage.py file in a Django project?

In a typical Django project, what does the manage.py file do when you run commands like python manage.py runserver?

A It acts as a command-line utility that lets you interact with the Django project, like running the server or migrations.

B It contains the main settings and configuration for the Django project.

C It stores the database models and schema definitions.

D It is the template file that defines the HTML layout for the project.

💡 Hint

Think about what you type in the terminal to start the server or make database changes.

The manage.py file is a command-line tool that helps you manage your Django project. It lets you run the development server, apply database migrations, create apps, and more.

❓ component_behavior

intermediate

What is the purpose of the settings.py file inside a Django project?

Inside the main Django project folder, there is a settings.py file. What is its main role?

A It holds the HTML templates for rendering pages.

B It contains the URL patterns that map URLs to views.

C It defines the configuration for the Django project, like database setup, installed apps, and middleware.

D It manages static files like CSS and JavaScript.

💡 Hint

Think about where you set your database or add apps in Django.

The settings.py file contains all the configuration settings for your Django project, including database connections, installed apps, middleware, and more.

📝 Syntax

advanced

What error occurs if urls.py is missing in a Django app?

If you create a new Django app but forget to add a urls.py file and try to include its URLs in the main project, what error will Django raise?

A TypeError: 'NoneType' object is not callable

B TemplateDoesNotExist error

C OperationalError related to the database

D ModuleNotFoundError: No module named 'app_name.urls'

💡 Hint

Think about what happens when Django tries to import a missing file.

If urls.py is missing in the app, Django cannot find the module when you try to include it in the main urls.py. This causes a ModuleNotFoundError.

❓ state_output

advanced

What is the output of running python manage.py startapp blog?

When you run python manage.py startapp blog in your Django project, what folder structure is created inside the blog app folder?

A Only a single file named blog.py is created.

B Folders and files: migrations/, admin.py, apps.py, models.py, tests.py, views.py, __init__.py

C A templates/ folder with HTML files is created.

D A static/ folder with CSS and JS files is created.

💡 Hint

Think about the default files Django creates for a new app.

The startapp command creates a folder with several default files and a migrations folder to help you build your app.

🧠 Conceptual

expert

Which folder in a Django project holds the HTML files for rendering views?

In a Django project, where should you place your HTML template files so that Django can find and render them properly?

A Inside a <code>templates/</code> folder either at the project level or inside each app folder.

B Inside the <code>static/</code> folder alongside CSS and JavaScript files.

C Inside the <code>migrations/</code> folder of each app.

D Directly inside the main project folder with <code>settings.py</code>.

💡 Hint

Templates are not static files but files used to generate HTML dynamically.

Django looks for HTML templates inside templates/ folders. These can be at the project root or inside individual apps to organize templates.

Practice

1. Which file in a Django project is used to run commands like starting the server or creating migrations?

easy

A. manage.py

B. settings.py

C. urls.py

D. wsgi.py

Solution

1. Step 1: Identify the command runner file

   The manage.py file is designed to run commands like starting the server or making migrations.

2. Step 2: Understand other files' roles

   settings.py holds configuration, urls.py routes URLs, and wsgi.py is for deployment interface.

3. Final Answer:

   manage.py -> Option A

4. Quick Check:

   Command runner = manage.py [OK]

Hint: Remember: manage.py runs commands for your project [OK]

Common Mistakes:

• Confusing settings.py as command runner
• Thinking urls.py runs commands
• Assuming wsgi.py runs server commands

2. Which folder typically contains the settings and URL configuration files in a Django project?

easy

A. The app folder

B. The templates folder

C. The project folder

D. The static folder

Solution

1. Step 1: Identify where settings.py and urls.py live

   These files are inside the main project folder, which shares the project name.

2. Step 2: Differentiate folders

   App folders contain app-specific code, templates hold HTML files, static holds CSS/JS/images.

3. Final Answer:

   The project folder -> Option C

4. Quick Check:

   Settings and URLs = project folder [OK]

Hint: Settings and URLs live in the project folder, not apps [OK]

Common Mistakes:

• Thinking settings.py is inside an app folder
• Confusing templates folder with project folder
• Assuming static folder holds config files

3. Given this Django project structure snippet:

myproject/
  manage.py
  myproject/
    settings.py
    urls.py
  blog/
    models.py
    views.py
    urls.py

Which file would you edit to add a new URL route for the blog app?

medium

A. myproject/settings.py

B. blog/urls.py

C. myproject/urls.py

D. manage.py

Solution

1. Step 1: Understand URL routing in Django

   The main project urls.py includes app URLs, but app-specific routes go in the app's urls.py.

2. Step 2: Locate where to add blog routes

   To add blog-specific URLs, edit blog/urls.py where blog views are connected to paths.

3. Final Answer:

   blog/urls.py -> Option B

4. Quick Check:

   App URLs go in app's urls.py [OK]

Hint: Add app URLs inside the app's own urls.py file [OK]

Common Mistakes:

• Adding app URLs directly in project urls.py
• Editing settings.py for URL routes
• Trying to add routes in manage.py

4. You try to run your Django project but get an error: ModuleNotFoundError: No module named 'blog'. Which of these is the most likely cause?

medium

A. You forgot to import models.py in views.py

B. You did not create a urls.py file in the blog app

C. You ran manage.py from the wrong folder

D. You forgot to add the blog app to INSTALLED_APPS in settings.py

Solution

1. Step 1: Understand the error meaning

   The error means Python cannot find the blog app module when loading the project.

2. Step 2: Check common causes

   Not adding the app name to INSTALLED_APPS in settings.py causes this error because Django doesn't recognize the app.

3. Final Answer:

   Forgot to add blog to INSTALLED_APPS -> Option D

4. Quick Check:

   Missing app in INSTALLED_APPS = ModuleNotFoundError [OK]

Hint: Always add new apps to INSTALLED_APPS in settings.py [OK]

Common Mistakes:

• Assuming missing urls.py causes ModuleNotFoundError
• Running manage.py from wrong folder usually gives different error
• Forgetting imports in views.py causes different errors

5. You want to create a new Django app called shop inside your project. Which sequence of actions correctly follows Django project structure best practices?

hard

A. Run python manage.py startapp shop, then add shop to INSTALLED_APPS in settings.py

B. Create a folder named shop manually, then add shop to urls.py

C. Add shop to INSTALLED_APPS first, then run python manage.py startapp shop

D. Run python manage.py startproject shop inside your project folder

Solution

1. Step 1: Create the app properly

   Use python manage.py startapp shop to create the app folder with correct files.

2. Step 2: Register the app in settings

   Add shop to INSTALLED_APPS in settings.py so Django knows about it.

3. Final Answer:

   Run startapp then add to INSTALLED_APPS -> Option A

4. Quick Check:

   Start app then register in settings [OK]

Hint: Always start app with manage.py then add to INSTALLED_APPS [OK]

Common Mistakes:

• Manually creating app folder misses essential files
• Adding app to INSTALLED_APPS before creating it
• Using startproject instead of startapp for apps