Python202.md

Python 201

Decorators

1. Allows modification of a function's behaviour without modifying the function
2. Requires an nested function

from datetime import datetime
import time\

def logger(func):
> def wrapper():
> print("-"*50)
> print(">>> Execution started {}".format(datetime.today().strftime("%Y-%m-%d %H:%M:%S")))
> print(">>> Execution completed {}".format(datetime.today().strftime("%Y-%m-%d %H:%M:%S")))
> print("-"*50)
return wrapper\

@logger #name of decorator\

def demo_function():
> print("Executing task!")
> time.sleep(3)
> print("Task completed!")\

demo_function()\

logger(demo_function()) # alternative way of running\