Python 获取和设置方法与@property 装饰器

Question

I am exploring decorators in Python, and as a person who came to Python from other languages, I am a bit confused about the purpose of @property and its @xxx.setter brother. In Java and C++ get_xxx() and set_xxx() are usually the way to organize encapsulation. In Python we have these two decorators, which require specific syntax, and name matching in order to work. How is @property better than get-set methods?

I have checked this post and still, what are the advantages of @property besides the availability of the += operator?

Answer 1

The best part of using property for an attribute is that you don't need it .

The philosophy in Python is that classes attributes and methods are all public, but by convention - when you prefix their name with a single "_"

The mechanism behing "property", the descriptor protocol, allows one to change a previous dumb plain attribute into an instrumented attribute, guarded with code for the getter and setter, if the system evolves to a situation where it is needed.

But by default, a name attribute in a class, is just a plain attribute. You do person.name = "Name" - no guards needed, no setting method needed nor recommended. When and if it one needs a guard for that (say, to capitalize the name, or filter on improper words), whatever code uses that attribute needs no change: with the use of property, attribute assignment still takes place with the "=" operator.

Other than that, if using "=" does not look prettier than person.set_name("Name") for you, I think it does for most people. Of course, that is subjective.