python3.4中自定义数组类(即重写数组类)

'''自定义数组类,实现数组中数字之间的四则运算,内积运算,大小比较,数组元素访问修改及成员测试等功能'''
class MyArray:
    '''保证输入值为数字元素(整型,浮点型,复数)'''
    def ___isNumber(self, n):
        if not isinstance(n,(int,float,complex)):
            return False
        return True
    #构造函数,进行必要的初始化
    def __init__(self,*args):
        if not args:
            self.__value = []
        else:
            for arg in args:
                if not self.___isNumber(arg):
                    print('All elements must be numbers')
                    return
            self.__value = list(args)
    @property
    def getValue(self):
        return self.__value
    #析构函数,释放内部封装的列表
    def __del__(self):
        del self.__value
    #重载运算符+
    def __add__(self, other):
        '''数组中每个元素都与数字other相加,或者两个数组相加,得到一个新数组'''
        if self.___isNumber(other):
            #数组与数字other相加
            b = MyArray()
            b.__value = [item + other for item in self.__value]
            return b
        elif isinstance(other,MyArray):
            #两个数组对应元素相加
            if (len(other.__value) == len(self.__value)):
                c = MyArray()
                c.__value = [i+j for i,j in zip(self.__value,other.__value)]
                return c
            else:
                print('Lenght no equal')
        else:
            print('Not supported')
    #重载运算符-
    def __sub__(self, other):
        '''数组元素与数字other做减法,得到一个新数组'''
        pass
    #重载运算符*
    def __mul__(self, other):
        '''数组元素与数字other做乘法,或者两个数组相乘,得到一个新数组'''
        pass
    #重载数组len,支持对象直接使用len()方法
    def __len__(self):
        return len(self.__value)
    #支持使用print()函数查看对象的值
    def __str__(self):
        return str(self.__value)
if __name__ == "__main__":
    print('Please use me as a module.')
    x = MyArray(1,12,15,14,1)
    print('%s
 array lenghts:%d'%(x,len(x)))
    x = x+2
    print(x.getValue)
原文地址:https://www.cnblogs.com/ysq0908/p/9157373.html