What are Python Decorators?
Decorators are special functions in Python that modify or enhance other functions without changing their actual code. They wrap another function to extend its behavior in a clean and readable way.
Why Use Decorators?
- Code Reusability: Apply the same enhancement to multiple functions without repeating code.
- Separation of Concerns: Keep core functionality separate from auxiliary features like logging or access control.
- Improved Readability: Make code more organized and easier to understand.
How to Use Decorators?
Creating a Simple Decorator
Let’s create a decorator that adds Filipino greetings before and after a function executes.
def filipino_greeting_decorator(func):
def wrapper():
print("Mabuhay! Starting the function...")
func()
print("Salamat! Function completed.")
return wrapper
@filipino_greeting_decorator
def celebrate_festival():
print("Nagpupugay sa Pasko at mga Pista!")
celebrate_festival()
"""
Expected Output:
Mabuhay! Starting the function...
Nagpupugay sa Pasko at mga Pista!
Salamat! Function completed.
"""Decorator with Arguments using enumerate
Enhance a function that schedules festival events by logging each event with its number.
def event_logger_decorator(func):
def wrapper(festival, events):
print(f"Scheduling events for {festival}:")
func(festival, events)
return wrapper
@event_logger_decorator
def schedule_events(festival, events):
for idx, event in enumerate(events, start=1):
print(f"{idx}. {event}")
festival_events = ["Street Dancing", "Parade", "Cultural Show", "Fireworks"]
schedule_events("Sinulog", festival_events)
"""
Expected Output:
Scheduling events for Sinulog:
1. Street Dancing
2. Parade
3. Cultural Show
4. Fireworks
"""