デコレーターのメモ

デコレーターの例。このデコレーターはある関数A内で使われている関数Bについて、
その関数Bの引数を{'関数B':*args, **kwargs}で指定して、関数Aの引数とすることで、関数B内で引き継がれるというもの。

def search_args_kwargs(func):
    func_name=func.__name__
    def wrapper(parent_kwargs, *args1, **kwargs1):
        if func_name in parent_kwargs:
            *args2, kwargs2=parent_kwargs[func.__name__]
            return func(*args1, *args2, **kwargs1, **kwargs2)
        else:
            return func(*args1, **kwargs1)
    return wrapper

def detail1(*args, **kwargs):
    string='My age is {}.'.format(*args)
    print(string)
    string='I was born in {year}.'.format(**kwargs)
    print(string)

def detail2(*args, **kwargs):
    string='Talking about My {} years old {} dog.'.format(*args)
    print(string)
    string='He was born in {year}, who likes {likes}.'.format(**kwargs)
    print(string)
    
def greeting(*args, **kwargs):
    string='I am a {}. My pet is {}'.format(*args)
    print(string)
    kwargs.update({'type_pet':args[1]})
    string='I am {me}. My {type_pet} is {pet}'.format(**kwargs)
    print(string)
    search_args_kwargs(detail1)(kwargs, 28, year=1991)
    search_args_kwargs(detail2)(kwargs, 3, year=2016)

greeting('human','dog', me='Taro', pet='Kuro',
         detail2=('cute',{'likes':'milk'}))

'''
>>I am a human. My pet is dog
I am Taro. My dog is Kuro
My age is 28.
I was born in 1991.
Talking about My 3 years old cute dog.
He was born in 2016, who likes milk.
'''

こちらはデコレーターの簡単な例

def deco(func):
    def wrapper(*args, **kwargs):
        print('Decorated!')
        return func(*args, **kwargs)
    return wrapper

@deco
def f(i):
    return i+1

f(1)

'''
>>Decorated!
2
'''