装饰器

装饰器（decorator）可以给函数动态加上功能。

对于类的方法，装饰器一样起作用。Python内置的@property装饰器就是负责把一个方法变成属性。

 

直观点，搞了实例后，调用方法可以不加括号（）。

 

另： https://blog.csdn.net/guofeng_hao/article/details/84645277

 

>>> class Student(object):
...    def __init__(self, name, score):
...       self.name = name
...       self.__score = score
...    @property
...    def score(self):
...       return self.__score
...    @score.setter
...    def score(self, score):
...       if score < 0 or score > 100:
...          raise ValueError('invalid score')
...       self.__score = score
...
>>> s = Student('Bob', 59)
>>> s.score
59
>>> s.score
59
>>> s.score = 70
>>> s.score
70
>>> s.score = 1000
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 11, in score
ValueError: invalid score

　　

 

>>> class Student(object):
...     def __init__(self, name, score):
...        self.name = name
...        self.__score = score
...     def score(self):
...        return self.__score
...     def score(self, score):
...        if score < 0 or score > 100:
...           raise ValueError('invalid score')
...        self.__score = score
...
>>>  s = Student('Bob', 59)
  File "<stdin>", line 1
    s = Student('Bob', 59)
    ^
IndentationError: unexpected indent
>>> s = Student('Bob', 59)
>>> s.score
<bound method Student.score of <__main__.Student object at 0x7f74da2db7b8>>
>>> s.score()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: score() missing 1 required positional argument: 'score'
>>> s.score(70)
>>> s.score()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: score() missing 1 required positional argument: 'score'