YouTip

By understanding Django's project structure, we can organize code more efficiently, follow Django's best practices, and build maintainable Web applications. In the previous chapter, we learned that when creating a new project using the `django-admin startproject` command, Django automatically generates the following basic structure: myproject/│├── manage.py └── myproject/ ├── __init__.py ├── settings.py ├── urls.py └── wsgi.py Use django-admin to create the HelloWorld project: django-admin startproject HelloWorld After creation, we can view the project's directory structure: !(#) | File/Directory | Detailed Description | | --- | --- | | **`manage.py`** | Django project's command-line management tool, which encapsulates the functionality of `django-admin` and automatically sets the `DJANGO_SETTINGS_MODULE` environment variable to point to the current project's configuration. All project management commands are executed through it, such as: - `runserver`: Start the development server - `makemigrations`: Generate database migration files - `shell`: Start Python shell with ORM | | **`db.sqlite3`** | SQLite database file used by default by Django, automatically generated after the first `migrate` command execution. Suitable for development environment, production environment should use PostgreSQL/MySQL. File location is defined by `DATABASES['default']['NAME']` in `settings.py`. | | **`__pycache__/`** | Bytecode cache directory generated by Python interpreter, contains `.pyc` files, used to speed up module loading. Should not be committed to version control (should be ignored in `.gitignore`). | !(#) * * * ## Core File Analysis ### manage.py `manage.py` is the entry point for Django project's command-line tool, it provides many useful commands: ## Example #!/usr/bin/env python import os import sys if __name__ =="__main__": os.environ.setdefault("DJANGO_SETTINGS_MODULE","myproject.settings") try: from django.core.management import execute_from_command_line except ImportError: # Handle import error pass execute_from_command_line(sys.argv) Common command examples: * `python manage.py runserver` - Start development server * `python manage.py migrate` - Apply database migrations * `python manage.py createsuperuser` - Create admin account ### settings.py `settings.py` is the configuration file for Django project, contains all important settings: ## Example # Key configuration options explained: DEBUG =True# Set to True during development to show detailed errors; must be changed to False in production ALLOWED_HOSTS =[]# When DEBUG=False, specify allowed domains (e.g., ['example.com']) INSTALLED_APPS =[ 'django.contrib.admin',# Admin site 'django.contrib.auth',# Authentication system 'django.contrib.contenttypes',# Content types framework 'django.contrib.sessions',# Session management 'django.contrib.messages',# Messaging framework 'django.contrib.staticfiles',# Static file management # Add custom apps: 'myapp.apps.MyAppConfig' ] DATABASES ={# Database configuration 'default': { 'ENGINE': 'django.db.backends.sqlite3', 'NAME': BASE_DIR / 'db.sqlite3',# Use pathlib syntax # MySQL example: # 'ENGINE': 'django.db.backends.mysql', # 'NAME': 'mydb', # 'USER': 'root', # 'PASSWORD': 'password', } } STATIC_URL ='/static/'