built in decorators in python

'pass function which we want to decorate in decorator callable object' def our_decorator(func): # func is function to be decorated by decorator def wrapper(x): # x is parameter which is passed in func if x%2==0: return func(x) else: raise Exception("number should be even") return wrapper @ our_decorator def func(x): # actual function print(x,"is even") func(2) func(1) ' if you do not want to use @' func=our_decorator(func) func(2)

python decorators

# 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()

Posted by: Guest on March-23-2021

#This function take user input for list and returns a tuple cotaining 2 lists #one of even numbers another of odd numbers def deco(function): def wrap(lst): even = [] odd = [] for i in lst: if i % 2 == 0: even.append(i) else: odd.append(i) return even,odd function(lst) return wrap @deco def display(lst): print(lst) a = [int(x) for x in input("Enter number of elements : ").split(",")] print(display(a))

# This function take input from user and return # list of 0 and 1, zero represents odd number # and 1 represents even number def deco(func): def wrap(lst): x = [1 if i % 2 == 0 else 0 for i in lst] return x func(lst) return wrap @deco def display(l): return (l) a = [int(x) for x in input("Enter number of elements : ").split(",")] print(display(a))

def deco(function): def wrap(num): if num % 2 == 0: print(num,"is even ") else: print(num,"is odd") function(num) return wrap @deco def display(num): return num display(9) # pass any number to check whether number is even or odd

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