Python自定义一个数组类，支持数组之间的四则运算和其他常见方法

Posted 2021-12-01 motorye

class MyArray:
    ‘‘‘保证输入的内容是整型、浮点型‘‘‘
    def ___isNumber(self, num):
        if not isinstance(num, (int,float)):
            return False
        return True

    #开始写构造函数,接受可变长度的数组
    def __init__(self, *args):
        if args == None:
            self.__value = []
        else:
            for a in args:
                if not self.___isNumber(a):
                    print(‘All elements must be number!‘)
            #self.__value 是一个数组
            self.__value = list(args)

    #打印输出当前的self.__value
    def printSelf(self):
        #这个self是一个地址
        print(self)
        #这个self.__value是一个数组
        print(self.__value)

    #重载len(Array)这个方法
    def __len__(self):
        return len(self.__value)

     #append方法
    def append(self, other):
        self.__value.append(other)
        #注意：此处不能够直接return self.__value.append(other)
        #这个方法执行后没有返回值
        return self.__value

    #重载运算符+
    def __add__(self,other):
        if self.___isNumber(other):
            #如果other 是一个数，则数组里每一个元素都加上other
            array = MyArray()
            array.__value = [ i + other for i in self.__value]
            return array.__value
        elif isinstance(other,MyArray):
            #如果other 是一个数组，则两个数组对应位置的数相加
            if (len(self.__value) == len(other.__value)):
                array = MyArray()
                array.__value = [i+j for i,j in zip(self.__value,other.__value)]
                return array.__value
            else:
                print(‘The size must be equal!‘)
        else:
            print(‘Please input a array or a num!‘)

   
    #重载运算符 / 浮点数除法，返回浮点数
    def __truediv__(self,other):
        if self.___isNumber(other):
            if other == 0:
                print("Zero cant be this number!")
                return 
            array = MyArray()
            array.__value = [i / other for i in self.__value]
            return array.__value
        else:
            print("It is must be a number except zero!")

    #重载运算符 // 整数除法，返回不大于结果的最大的一个整数
    def __floordiv__(self,other):
        if isinstance(other,int):
            if other == 0:
                print("Zero cant be this number!")
                return
            array = MyArray()
            array.__value = [i // other for i in self.__value]
            return array.__value
        else:
            print("Tt is must be a number except zero!")

    #重载运算符% 取余数
    def __mod__(self,other):
        if isinstance(other,int):
            if other == 0:
                print("Zero cant be this number!")
                return
            array = MyArray()
            array.__value = [i % other for i in self.__value]
            return array.__value
        else:
            print("Tt is must be a number!")

    #根据数组index查看元素
    def __getitem__(self,index):
        arrayLength = len(self.__value)
        if isinstance(index,int) and (0 <= index <= arrayLength):
            return self.__value[index]
        else:
            print("Index must be a Inteager which is less than", arrayLength-1)
        
    #查看元素是否在该列表
    def __contains__(self,other):
        if other in self.__value:
            return True
        return False

    #数组比较
    def __lt__(self,other):
        if not isinstance(other,MyArray):
            print("It is must be the type of MyArray")
            return False
        if self.__value < other.__value:
            return True
        return False