How python defines multiple constructors in a class

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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.

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