By: Koothrapalli in Python Tutorials on 2012-04-07
In Python, delegation refers to the process of passing a method call from one object to another object that performs the actual behavior of the method. Delegation is a design pattern that allows objects to collaborate with each other in a flexible and dynamic way.
Delegation can be implemented in Python by defining a class that contains a reference to another object and delegates method calls to that object. The delegated object is typically passed as an argument to the constructor of the delegating class.
Here's an example:
class Delegate: def do_something(self): print('Delegate doing something') class Delegator: def __init__(self, delegate): self.delegate = delegate def do_something(self): self.delegate.do_something() delegate = Delegate() delegator = Delegator(delegate) delegator.do_something() # Output: Delegate doing something
In this example, the
Delegate class defines the behavior of the
do_something() method. The
Delegator class contains a reference to a
Delegate object and delegates calls to the
do_something() method to that object.
When an instance of
Delegator is created, it is passed an instance of
Delegate as an argument. The
do_something() method of
Delegator simply calls the
do_something() method of the
By using delegation, the behavior of
Delegator can be changed dynamically by passing in different objects that implement the same methods as
Delegate. This makes it easy to modify the behavior of an object at runtime without having to change its implementation directly.
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