esenthil2018

#Passing Arguments to the wrapper function
def decor_func(fn):
  def wrapper(*args, **kwargs):
    return fn(*args, **kwargs)
  return wrapper

esenthil2018

from functools import lru_cache
@lru_cache()
def factor(n):
    print('Factor{0}!'.format(n))
    return 1 if n < 2 else n * factor(n-1)
    
factor(5)

esenthil2018

def factor(n):
    print('Factor{0}!'.format(n))
    return 1 if n < 2 else n * factor(n-1)
    
factor(5)

esenthil2018

@logged
@time
def product(a,b,c):
  print('The product of a*b*c:', a*b*c)


product(3,5,6)

esenthil2018

def time(fn):
    from functools import wraps
    from time import perf_counter
    
    @wraps(fn)
    def wrapper(*args, **kwargs):
        start = perf_counter()
        res = fn(*args, **kwargs)
        end = perf_counter()
        print('{0} ran for {1:.6f}s'.format(fn.__name__, end-start))

esenthil2018

def logged(fn):
    from functools import wraps
    from datetime import datetime, timezone
    
    @wraps(fn)
    def wrapper(*args, **kwargs):
        run = datetime.now(timezone.utc)
        res = fn(*args, **kwargs)
        print('{0}: called {1}'.format(fn.__name__, run))
        return res

esenthil2018

# passing the argument:
def passing_arguments(fn):
    def wrapper_arguments(arg1, arg2):
        print ('Arguments are passed:', arg1,",", arg2)
        fn(arg1, arg2)
    return wrapper_arguments

@passing_arguments
def orig_function(city, state):
    print ('My city is', city)

esenthil2018

# This the first decorator
def decon_first(fn):
    # The new function the decorator returns
    def wrapper():
        # Insertion of some code before and after
        print('This is the first decorator')
        return fn() 
    return wrapper

# This the second decorator

esenthil2018

def decor_func(fn):
  @wraps(fn)
  def wrapper_func(*args,**kwargs):

    """
    This is the wrapper function
    """
    print('Execute this code before the main function is executed')
    return fn(*args, **kwargs)
  return wrapper_func

esenthil2018

import functools
def decor_func(fn):

  @functools.wraps(fn)
  def wrapper():
  # Write some code before the funtion or after the function
    return fn()
  return wrapper