PyPro #62 Factory Design Pattern

Factory Design Pattern in Python

Factory Design Pattern in Python

Write a Python program to implement Factory Design Pattern.

Factory

# Different classes denoting different types of objects having a common characteristic: Knight, Rook & Bishop
class Rook:
    '''A simple Rook class'''
    def move(self):
        return "I move any number of spaces but only horizontally or vertically."
 
class Knight:
    '''A simple Knight class'''
    def move(self):
        return "I move 2 and half spaces."
 
class Bishop:
    '''A simple Bishop class'''
    def move(self):
        return "I move any number of spaces diagonally."
 
# A Factory Method that returns the object based on an input.
def makeChessPiece(piece):
    '''Factory method that takes a string and returns an object based on it.'''
    pieces = {"knight": Knight(), "bishop": Bishop(), "rook": Rook()}
    return pieces[piece]
 
class ChessPieceFactory:
    def createChessPiece(self, inputString):
        createdPiece = makeChessPiece(inputString)
        return createdPiece   
 
chessPieceFactory = ChessPieceFactory()
 
pieceOne = chessPieceFactory.createChessPiece('knight')
print("Knight:", pieceOne.move())
 
pieceTwo = chessPieceFactory.createChessPiece('bishop')
print("Bishop:", pieceTwo.move())
 
pieceThree = chessPieceFactory.createChessPiece('rook')
print("Rook:", pieceThree.move())
 
 
### OUTPUT ###
Knight: I move 2 and half spaces.
Bishop: I move any number of spaces diagonally.
Rook: I move any number of spaces but only horizontally or vertically.

See also:

• Python 101
• Object Oriented Python
• Design Patterns in Python
• 50+ Handy Standard Library Modules
• 60+ Handy Third Library Modules
• 50+ Tips & Tricks for Python Developers
• 50+ Know-How(s) Every Pythonista Must Know