Debugging is the process of identifying and resolving issues in your application. Django offers several tools and techniques to make debugging easier.

Debugging with Django Error Pages

When DEBUG = True in your settings.py, Django provides detailed error pages that display:

• The type of error.
• The line of code that caused the error.
• The traceback of the error.
• Variables available at the time of the error.

These error pages are invaluable during development.

Logging in Django

Logging allows you to capture runtime information for debugging and monitoring your application. You can configure Django’s logging in the settings.py file.

Example of Logging Configuration:

# settings.py
import os

LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'handlers': {
        'file': {
            'level': 'DEBUG',
            'class': 'logging.FileHandler',
            'filename': os.path.join(BASE_DIR, 'debug.log'),
        },
    },
    'loggers': {
        'django': {
            'handlers': ['file'],
            'level': 'DEBUG',
            'propagate': True,
        },
    },
}

Now, debug logs will be written to a file named debug.log.

Using print and pdb

• print Statements: Quick and easy debugging by adding print() statements in your code.
• pdb (Python Debugger): Allows you to set breakpoints and inspect variables interactively.

Example with pdb:

import pdb

def my_view(request):
    pdb.set_trace()  # This pauses execution and opens an interactive debugger
    # Your logic here

Run the Django development server in the terminal to use pdb.