自定义数组。在MyArray.py文件中，定义了一个数组类，重写了一部分特殊方法以支持数组之间、数组与整数之间的四则运算以及内积、大小比较、成员测试和元素访问等运算符。 用python

可以这样实现：

class MyArray:
    def __init__(self, arr):
        self.arr = arr
    
    def __add__(self, other):
        temp_arr = []
        if isinstance(other, MyArray):
            for i in range(len(self.arr)):
                temp_arr.append(self.arr[i] + other.arr[i])
        elif isinstance(other, int):
            for i in range(len(self.arr)):
                temp_arr.append(self.arr[i] + other)
        else:
            raise TypeError("unsupported operand type(s) for +: 'MyArray' and '{}'".format(type(other)))
        return MyArray(temp_arr)

    def __sub__(self, other):
        temp_arr = []
        if isinstance(other, MyArray):
            for i in range(len(self.arr)):
                temp_arr.append(self.arr[i] - other.arr[i])
        elif isinstance(other, int):
            for i in range(len(self.arr)):
                temp_arr.append(self.arr[i] - other)
        else:
            raise TypeError("unsupported operand type(s) for -: 'MyArray' and '{}'".format(type(other)))
        return MyArray(temp_arr)

    def __mul__(self, other):
        temp_arr = []
        if isinstance(other, MyArray):
            for i in range(len(self.arr)):
                temp_arr.append(self.arr[i] * other.arr[i])
        elif isinstance(other, int):
            for i in range(len(self.arr)):
                temp_arr.append(self.arr[i] * other)
        else:
            raise TypeError("unsupported operand type(s) for *: 'MyArray' and '{}'".format(type(other)))
        return MyArray(temp_arr)

    def __matmul__(self, other):
        if not isinstance(other, MyArray):
            raise TypeError("unsupported operand type(s) for @: 'MyArray' and '{}'".format(type(other)))
        if len(self.arr) != len(other.arr):
            raise ValueError("matmul: Input operand shapes do not match")
        result = 0
        for i in range(len(self.arr)):
            result += self.arr[i] * other.arr[i]
        return result

    def __lt__(self, other):
        if not isinstance(other, MyArray):
            raise TypeError("unorderable types: MyArray() < {}()".format(type(other)))
        if len(self.arr) != len(other.arr):
            raise ValueError("comparison of arrays with different lengths is not supported")
        for i in range(len(self.arr)):
            if self.arr[i] >= other.arr[i]:
                return False
        return True

    def __contains__(self, item):
        for i in range(len(self.arr)):
            if self.arr[i] == item:
                return True
        return False

    def __getitem__(self, index):
        return self.arr[index]

    def __str__(self):
        return str(self.arr)

这里重写的特殊方法包括 `__add__`、`__sub__`、`__mul__`、`__matmul__`、`__lt__`、`__contains__` 和 `__getitem__`，分别表示加法、减法、乘法、内积、大小比较、成员测试和元素访问等运算符。其中，`__matmul__` 表示矩阵乘法运算符 `@`，而 `__lt__` 表示小于号 `<`。`__str__` 方法则用于将数组对象转换成字符串表示。