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  • 设计模式之策略模式

    from abc import ABCMeta, abstractmethod
    from operator import itemgetter, attrgetter
    
    
    
    
    # 策略模式:三个角色:上下文环境、策略的抽象、具体的策略
    # 简而言之:定义一系列算法,将每个算法都封装起来,并且使他们之间可以相互替换。
    class Person:
        def __init__(self, name, age, weight, height):
            self.name = name
            self.age = age
            self.weight = weight
            self.height = height
    
        def showMyself(self):
            print("%s 年龄:%d 岁,体重: %0.2fkg,身高:%0.2fm" %(self.name, self.age, self.weight, self.height))
    
    
    class ICompare(metaclass=ABCMeta):
        """比较算法"""
        @abstractmethod
        def comparable(self, person1, person2):
            pass
    
    class CompareByAge(ICompare):
        """通过年龄排序"""
        def comparable(self, person1, person2):
            return person1.age - person2.age
    
    
    class CompareByHeight(ICompare):
        """通过身高排序"""
        def comparable(self, person1, person2):
            return person1.height - person2.height
    
    
    class CompareByWeight(ICompare):
        """通过体重排序"""
        def comparable(self, person1, person2):
            return person1.weight - person2.weight
    
    
    class SortPerson:
        """Person的排序类"""
        def __init__(self, compare):
            self.__compare = compare
    
        def sort(self, personList):
            """
            排序算法
            采用最简单的冒泡排序
            """
            n = len(personList)
            for i in range(0, n - 1):
                for j in range(0, n - 1 -i):
                    if (self.__compare.comparable(personList[j], personList[j+1])) > 0:
                        tmp = personList[j]
                        personList[j] = personList[j+1]
                        personList[j+1] = tmp
            
    
    if __name__ == "__main__":
        personList = [
            Person("Tony", 2, 54.5, 0.82),
            Person("Jack", 3, 52.5, 0.86),
            Person("Eric", 5, 45.5, 0.72),
            Person("Helen", 1, 58.5, 0.84),
        ]
    
        # sortedPersons = sorted(personList, key=attrgetter("age"))
    
        ageSorter = SortPerson(CompareByAge())
        ageSorter.sort(personList)
        print("根据年龄排序后的结果:")
        for person in personList:
            person.showMyself()
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  • 原文地址:https://www.cnblogs.com/loveprogramme/p/13062769.html
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