Constructor

Constructors

A constructor is a method called in class objects. Constructors instantiate the object and initialize anything that is declared within this method. Every class needs a constructor, even if it is a default constructor. Constructors can either accept parameters, or not. Parameters are not needed for it to be a constructor, but depending on the program, parameters may be needed.

Source: 1

class Class_name(object):
     def __init__(self):
          pass

The above code is a simple class with a constructor that has no parameters.

class Class_name(object):
     def __init__(self, itemName, itemNumber):
          pass

The above code is a simple class with a constructor that has parameters itemNumber and itemName.

Sources:

1. http://www.dummies.com/how-to/content/how-to-create-a-constructor-in-python.html