Python Design Patterns - Template Pattern

A template pattern defines a basic algorithm in a base class using abstract operation where subclasses override the concrete behavior. The template pattern keeps the outline of algorithm in a separate method. This method is referred as the template method.

Following are the different features of the template pattern −

• It defines the skeleton of algorithm in an operation

• It includes subclasses, which redefine certain steps of an algorithm.

Example - Usage of Template Pattern

main.py

class MakeMeal:

   def prepare(self): pass
   def cook(self): pass
   def eat(self): pass

   def go(self):
      self.prepare()
      self.cook()
      self.eat()

class MakePizza(MakeMeal):
   def prepare(self):
      print("Prepare Pizza")
   
   def cook(self):
      print("Cook Pizza")
   
   def eat(self):
      print("Eat Pizza")

class MakeTea(MakeMeal):
   def prepare(self):
      print("Prepare Tea")
	
   def cook(self):
      print("Cook Tea")
   
   def eat(self):
      print("Eat Tea")

makePizza = MakePizza()
makePizza.go()

print(25*"+")

makeTea = MakeTea()
makeTea.go()

Output

The above program generates the following output −

Prepare Pizza
Cook Pizza
Eat Pizza
+++++++++++++++++++++++++
Prepare Tea
Cook Tea
Eat Tea

Explanation

This code creates a template to prepare meal. Here, each parameter represents the attribute to create a part of meal like tea, pizza, etc.

The output represents the visualization of attributes.