python-patterns/strategy.py

'''http://stackoverflow.com/questions/963965/how-is-this-strategy-pattern-written-in-python-the-sample-in-wikipedia'''

import types  

class StrategyExample:      

    def __init__(self, func=None):         
        self.name = "Strategy Example 0"         
        if func :              
            self.execute = types.MethodType(func, self)      

    def execute(self):         
        print(self.name)   

def executeReplacement1(self):         
    print(self.name + " from execute 1")   

def executeReplacement2(self):          
    print(self.name + " from execute 2")  

if __name__ == "__main__":      
    strat0 = StrategyExample()     

    strat1 = StrategyExample(executeReplacement1)     
    strat1.name = "Strategy Example 1"     

    strat2 = StrategyExample(executeReplacement2)     
    strat2.name = "Strategy Example 2"      

    strat0.execute()     
    strat1.execute()     
    strat2.execute()