Python Design Patterns - Template


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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.

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 −

Template Pattern

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.



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