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This article shows you how to write the code for the use of _ _ init__ and _ _ new__, the content is concise and easy to understand, and it will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

The code is as follows:

# 011. Briefly describe the difference between _ _ new__ and _ _ init__ in object-oriented

# _ _ init__ is called when the instance object is created, and then sets some initial values of the object properties.

# _ _ new__ is called before the instance is created, because its task is to create the instance and return it, which is a static method.

Class Book: def _ new__ (cls, title): if not hasattr (cls, "_ ins"): cls._ins=super (). _ new__ (cls) print ('in _ new__') return cls._ins

Def _ init__ (self, title): print ('in _ init__') super (). _ init__ () self.title = title

If _ _ name__ ='_ main__': b = Book ('The Spider Book') b2 = Book (' The Flask Book') print (id (b)) print (id (b2) print (b.title) print (b2.title))

# that is, _ _ new__ is called before _ _ init__, and the return value of _ _ new__ (instance) # will be passed to the first parameter of the _ _ init__ method, and then _ _ init__ will set some parameters to the instance, that is, how to write the code for the use of _ _ init__ and _ _ new__. Have you learned any knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.

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