学步园

公司员工的实现

def new(cls, *args, **kwargs):<br /> return cls(*args, **kwargs)</p> <p>class Number(object):<br /> pass</p> <p>class IntegralNumber(int, Number):<br /> def toInt(self):<br /> return new (int, self)</p> <p>class InternalBase(object):<br /> def __init__(self, base):<br /> self.base = base.toInt()</p> <p> def getBase(self):<br /> return new (IntegralNumber, self.base)</p> <p>class MathematicsSystem(object):<br /> def __init__(self, ibase):<br /> Abstract</p> <p> @classmethod<br /> def getInstance(cls, ibase):<br /> try:<br /> cls.__instance<br /> except AttributeError:<br /> cls.__instance = new (cls, ibase)<br /> return cls.__instance</p> <p>class StandardMathematicsSystem(MathematicsSystem):<br /> def __init__(self, ibase):<br /> if ibase.getBase() != new (IntegralNumber, 2):<br /> raise NotImplementedError<br /> self.base = ibase.getBase()</p> <p> def calculateFactorial(self, target):<br /> result = new (IntegralNumber, 1)<br /> i = new (IntegralNumber, 2)<br /> while i <= target:<br /> result = result * i<br /> i = i + new (IntegralNumber, 1)<br /> return result</p> <p>print StandardMathematicsSystem.getInstance(new (InternalBase, new (IntegralNumber, 2))).calculateFactorial(new (IntegralNumber, 6)) 

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(工资是按程序的行数记的)