I have converted another example of strategy which I prefer to the 2
described earlier, here it is:
class FindMinima:
def algorithm(self):raise NotImplementedError
class LeastSquares (FindMinima):
def algorithm(self,line):
return (1.1,2.2)
class NewtonsMethod (FindMinima):
def algorithm(self,line):
return (3.3,4.4)
class Bisection (FindMinima):
def algorithm(self,line):
return (5.5,6.6)
class ConjugateGradient (FindMinima):
def algorithm(self,line):
return (3.3,4.4)
class MinimaSolver: # context class
strategy=''
def __init__ (self,strategy):
self.strategy=strategy
def minima(self,line):
return self.strategy.algorithm(line)
def changeAlgorithm(self,newAlgorithm):
self.strategy = newAlgorithm
def test():
solver=MinimaSolver(LeastSquares())
print solver.minima((5.5,5.5))
solver.changeAlgorithm(Bisection())
print solver.minima((5.5,5.5))
test()
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