4.9 데코레이터

23 Feb 2018 • IntroducingPython

** 데코레이터는 하나의 함수를 취해서 또 다른 함수를 반환하는 함수다. **

def document_it(func):
def new_function(*args, **kwargs):
print('Running function:', func.__name__)
print('Positional arguments:', args)
print('Keyword arguments:', kwargs)
print('args', args)
result = func(*args, **kwargs)
print('Result_doc', result)
return result
return new_function

def add_ints(a, b):
return a + b

add_ints(3,5)

8

cooler_add_ints= document_it(add_ints)

cooler_add_ints(3,5)

Running function: add_ints Positional arguments: (3, 5) Keyword arguments: {} args (3, 5) Result_doc 8 8

수동으로 데코레이터를 적용함

@document_it
def sub_ints(a, b):
return a-b

sub_ints(3,5)

Running function: sub_ints Positional arguments: (3, 5) Keyword arguments: {} args (3, 5) Result_doc -2 -2 ** 자동으로 `@데코레이터_이름 을 추가하여 사용 가능하다 **

def square_it(func):
def new_function(*args, **kwargs):
print('square_args:', args)
result = func(*args, **kwargs)
print('square:', result)
return result * result
return new_function

@document_it
@square_it
def add_ints(a, b):
return a + b

add_ints(3, 5)

Running function: new_function Positional arguments: (3, 5) Keyword arguments: {} args (3, 5) square_args: (3, 5) square: 8 Result_doc 64 64

@square_it
@document_it
def add_ints(a, b):
return a + b

add_ints(3,5)

square_args: (3, 5) Running function: add_ints Positional arguments: (3, 5) Keyword arguments: {} args (3, 5) Result_doc 8 square: 8 64

 IntroducingPython

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