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This article will explain in detail how python defines multiple constructors in a class. The editor thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

Define multiple constructors in a class

Function overloading is a very common feature in programming languages (excluding Python). Even if you can't overload a normal function, you can still overload the constructor using class methods:

Import datetime class Date: def _ _ init__ (self, year, month, day): self.year = year self.month = month self.day = day @ classmethod def today (cls): t = datetime.datetime.now () return cls (t.year, t.month T.day) d = Date.today () print (f "{d.day} / {d.month} / {d.year}")

You might prefer to put all the logic of the alternative constructor in _ _ init__, and use * args, * * kwargs, and a bunch of if statements, rather than using class methods. That may work, but it becomes difficult to read and maintain.

Therefore, I recommend putting very little logic into _ _ init__, and performing all operations in a separate method / constructor. In this way, all you get is clean code for both the maintainer and the user of the class.

This is the end of this article on "how python defines multiple constructors in a class". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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