Dp Servant

In this tutorial, you'll learn about How to Fix Servant Errors. We cover key concepts, practical examples, and best practices.

Fix servant errors when utility method duplicated across classes or static helper smells.

Quick Fix

Wrong

class Circle:
    def move(self,dx,dy): self.x+=dx; self.y+=dy
class Square:
    def move(self,dx,dy): self.x+=dx; self.y+=dy  # duplicated!

move() method duplicated in every shape class. Same logic, different class.

Right

class Movable:
    def move(self,dx,dy): self.x+=dx; self.y+=dy
class Circle(Movable):
    def __init__(self): self.x=0; self.y=0
class Square(Movable):
    def __init__(self): self.x=0; self.y=0
# Or servant pattern:
class MoveServant:
    @staticmethod
    def move_to(obj,dx,dy):
        obj.x+=dx; obj.y+=dy
c=Circle(); MoveServant.move_to(c,5,10)

Move logic encapsulated once in servant. Shared across classes without inheritance.

Prevention

Servant provides shared behavior to unrelated classes. Alternatively: mixin or trait.

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