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")
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 + ydef 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# 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"))# decorator function to convert to lowercase
def lowercase_decorator(function):
def wrapper():
func = function()
string_lowercase = func.lower()
return string_lowercase
return wrapper
# decorator function to split words
def splitter_decorator(function):
def wrapper():
func = function()
string_split = func.split()
return string_split
return wrapper
@splitter_decorator # this is executed next
@lowercase_decorator # this is executed first
def hello():
return 'Hello World'
hello() # output => [ 'hello' , 'world' ]#a decoratoradds a bahavior to an existing function or class
#it uses the @ sign plus name of decoorator on a line above a function to be decorated
# e.g. here is aDecorator that is a wrapper function
def aDecorator(func): #func is the wrapped function
def wrapper(*args, **kwargs):
ret = func(*args, **kwargs) #get reault of wrapped function
return f' Decorator has converted result to upper-case: {ret.upper()} '
return wrapper #wrapper contains the decoration and result of wrapped function
@aDecorator # aDecorator is the wrapper function
def exampleFunction():
return "basic output" #lower-case string
print(exampleFunction()) #addDecoration adds note and converts to Upper-case
#Output:
# Decorator has converted result to upper-case: BASIC OUTPUT