def document_it(func):

    def new_function(*args, **kwargs):

        print('Running function:', func.__name__)

        print('Positional arguments:', args)

        print('Keyword arguments:', kwargs)

        result = func(*args, **kwargs)

        print('Result:', result)

        return result

    return new_function

#def add_ints(a, b):

#    return a + b

#cooler_add_ints = document_it(add_ints)

#cooler_add_ints(3, 5)

#('Running function:', 'add_ints')

#('Positional arguments:', (3, 5))

#('Keyword arguments:', {})

#('Result:', 8)

#@document_it

#def add_ints(a, b):

#    return a + b

#add_ints(3, 5)

def square_it(func):

    def new_function(*args, **kwargs):

        result = func(*args, **kwargs)

        return result * result

    return new_function

#@square_it

#@document_it

#def add_ints(a, b):

#    return a + b

#add_ints(3, 5)

#('Running function:', 'add_ints')

#('Positional arguments:', (3, 5))

#('Keyword arguments:', {})

#('Result:', 8)

@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:', {})

#('Result:', 64)

#靠近函数定义的装饰器最先执行

def log(func):

    def wrapper(*args, **kw):

        print('call %s():' % func.__name__)

        return func(*args, **kw)

    return wrapper

@log

def now():

    print('2015-3-25')

now()

#call now():

#2015-3-25

def log(text):

    def decorator(func):

        def wrapper(*args, **kw):

            print('%s %s():' % (text, func.__name__))

            return func(*args, **kw)

        return wrapper

    return decorator

@log('execute')

def now():

    print('2015-3-25')

now()

print(now.__name__)

#execute now():

#2015-3-25

#wrapper