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")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()python decorator
# Decorator with arguments
import functools
# First function takes the wanted number of repetition
def repeat(num_times):
# Second function takes the function
def decorator_repeat(func):
# Third function, the wrapper executes the function the number of times wanted
# functools decorator to print the true name of the function passed instead of "wrapper"
@functools.wraps(func)
def wrapper(*args, **kwargs):
for _ in range(num_times):
result= func(*args, **kwargs)
return result
return wrapper
return decorator_repeat
# Our function using the decorator
@repeat(num_times= 3)
def greet(name):
print(f"Hello {name}")
greet("thomas")python creare decoratori
def funzione_decoratore(funzione_parametro):
def wrapper():
""" nome convenzionale - wrapper significa 'incarto, confezione' """
print("... codice da eseguire prima di 'funzione_parametro' ...")
funzione_parametro()
print("... codice da eseguire dopo di 'funzione_parametro' ...")
return wrapper
def mia_funzione():
print("Hello World!")python creare decoratori
mia_funzione = funzione_decoratore(mia_funzione)
mia_funzione()
# output:
... codice da eseguire prima di funzione_parametro ...
Hello World!
... codice da eseguire dopo di funzione_parametro ...Copyright © 2021 Codeinu
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