Help us understand the problem. What is going on with this article?

デコレータ

decorator.py
def print_info(func):
    def wrapper(*args, **kwargs):
        print('start')
        result = func(*args,**kwargs)
        print('end')
        return result
    return wrapper

#関数に何かを付け加える場合に便利(デコレーターを複数適用する場合は順番に注意)
@print_info
def add_num(a, b):
    return a+b

r = add_num(10,20)
print(r)
#デコレータを使わない場合、下記のように書けるが分かりにくい
#f = print_info(add_num)
#r = f(10,20)
#print(r)

出力:

start
end
30
Why not register and get more from Qiita?
  1. We will deliver articles that match you
    By following users and tags, you can catch up information on technical fields that you are interested in as a whole
  2. you can read useful information later efficiently
    By "stocking" the articles you like, you can search right away
Comments
No comments
Sign up for free and join this conversation.
If you already have a Qiita account
Why do not you register as a user and use Qiita more conveniently?
You need to log in to use this function. Qiita can be used more conveniently after logging in.
You seem to be reading articles frequently this month. Qiita can be used more conveniently after logging in.
  1. We will deliver articles that match you
    By following users and tags, you can catch up information on technical fields that you are interested in as a whole
  2. you can read useful information later efficiently
    By "stocking" the articles you like, you can search right away
ユーザーは見つかりませんでした