Wrapper Classes

A function in Python is a first-order object. A function can have another function as its argument and wrap another function definition inside it. This helps in modifying a function without actually changing it. Such functions are called decorators.

This feature is also available for wrapping a class. This technique is used to manage the class after it is instantiated by wrapping its logic inside a decorator.

Example

Open Compiler

defdecorator_function(Wrapped):classWrapper:def__init__(self,x):
         self.wrap = Wrapped(x)defprint_name(self):return self.wrap.name
   return Wrapper
   
@decorator_functionclassWrapped:def__init__(self,x):
      self.name = x
      
obj = Wrapped('TutorialsPoint')print(obj.print_name())

Here, Wrapped is the name of the class to be wrapped. It is passed as argument to a function. Inside the function, we have a Wrapper class, modify its behavior with the attributes of the passed class, and return the modified class. The returned class is instantiated and its method can now be called.

When you execute this code, it will produce the following output −

TutorialsPoint