Code Programming Tutorials, Guides & Best Practices

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This snippet sets up a logger that writes log messages to both the console and a file, with different log levels to capture various types of information.

import logging
import os

# Create a directory for logs if it doesn't exist
if not os.path.exists('logs'):
    os.makedirs('logs')

# Configure the logger
logging.basicConfig(
    level=logging.DEBUG,  # Set the logging level
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
    handlers=[
        logging.FileHandler('logs/app.log'),  # Log to a file
        logging.StreamHandler()               # Log to the console
    ]
)

# Get the logger instance
logger = logging.getLogger('MyAppLogger')

# Example usage of the logger
def divide_numbers(x, y):
    try:
        logger.debug(f"Attempting to divide {x} by {y}")
        result = x / y
        logger.info(f"Division successful: {result}")
        return result
    except ZeroDivisionError as e:
        logger.error("Division by zero error", exc_info=True)
    except Exception as e:
        logger.exception("An unexpected error occurred")

# Demonstrate logging in action
if __name__ == "__main__":
    divide_numbers(10, 2)  # Normal operation
    divide_numbers(10, 0)  # Division by zero

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• The first callback (result => { ... }) handles the resolved value, printing out the result.
• The second callback (error => { ... }) handles any rejected value (errors), printing out the error message.