Python decorator

Decorator python

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")

Source: python-course.eu

Decorators in python

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

Decorators in python

# this functon converts any string into uppercase
def deco(function):
    def wrap(s):
        return s.upper()
        function(s)
    return wrap

@deco
def display(s):
    return s 
print(display("not bad"))

Python decorator

from functools import wraps
def debug(func):
    @wraps(func)
    def out(*args, **kwargs):
        print('hello world')
        return func(*args, **kwargs)
    return out

@debug
def add(x, y):
    return x + y

Python decorator

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

Python creare decoratori

@funzione_decoratore
def mia_funzione(): 
    print("Hello World!") 

mia_funzione()
# output:

... codice da eseguire prima di funzione_parametro ...
hello world!
... codice da eseguire dopo di funzione_parametro ...

Source: programmareinpython.it

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