python create a decorator

def our_decorator(func): def function_wrapper(x): print("Before calling " + func.__name__) func(x) print("After calling " + func.__name__) return function_wrapper @our_decorator def foo(x): print("Hi, foo has been called with " + str(x)) foo("Hi")

# decorators are user to decorate functions like what to do before/after calling the function import time def delay_decorator(function): def wrapper_function(): print("-----------------------I am gonna greet you--------------------------") time.sleep(2)# waits for 2 seconds function() # calls the function time.sleep(1)# waits for 1 sec print("------------------How do you feel about that greet?-------------------") return wrapper_function @delay_decorator def greet(): print("Helllllloooooooooo") greet()

python decorator

import functools

# A decorator is a Higher order function "_with_logging"
# It takes the function to be decorated as its argument
# In order to pass in some arbitrary arguments, it must be wrapped into
# another HOF (Higher order function) that will receive the inputs
def with_logging(level=logging.DEBUG, msg = None):
    def _with_logging(fn):
        # 'wraps' is a HOF that will give fn's name and docs to decorated_fn i.e. 
        #   decorated_fn.__name__ = fn.__name__
        #   help(decorated_fn) = help(fn)
        @functools.wraps(fn)
        def decorated_fn(*args, **kwargs):
            res = fn(*args, **kwargs)
            print("n***************", f"n{msg}", "nExecuting with Args: ", *args, **kwargs)
            logging.log(level, res)
            return res
        return decorated_fn
    return _with_logging
  
# Used this way
@with_logging(level=logging.DEBUG, msg="Some awesome comment")
def hello_world(name):
  return f'Hello World {name}'
  
# Results after calling hello_world("John")
#
# ***************
# Some awesome comment
# Executing with Args: John
# Hello World John

Posted by: Guest on March-14-2021

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