我正在嘗試創(chuàng)建一個(gè) Matrix 類。但是，當(dāng)我創(chuàng)建它時(shí)它會給我?guī)礤e(cuò)誤。我試圖刪除 self._theGrid.clear(0) 但矩陣將被初始化為 None 而不是 0。from array_ import Array2Dclass Matrix :    # Creates a matrix of size numRows x numClos initialized to 0.    def __init__(self, numRows, numCols):        self._theGrid = Array2D(numRows, numCols)        self._theGrid.clear(0)    ....在我創(chuàng)建的模塊中。我正在使用以下模塊來創(chuàng)建矩陣。# Implement the Array ADT using the array capabilities of the ctypes moduleimport ctypesclass Array:     # Create array with the size elements    def __init__(self, size):        assert size > 0, "Array size must be > 0"        self._size = size         # Create the array structure using ctypes module        PyArrayType = ctypes.py_object * size        self._elements = PyArrayType()         # Initialize each element        self.clear(None)     # Returns the size of the array    def __len__(self):        return self._size     # Get the contents of the index element    def __getitem__(self, index):        assert index >= 0 and index < len(self), "Array subscripts out of range"        return self._elements[index]      # Puts the value in the array element at index position.    def __setitem__(self, index, value):        assert index >= 0 and index < len(self), "Array subscripts out of range"        self._elements[index] = value     # Clear the array by setting each element to the given value.    def clear (self, value):        for i in range(len(self)):            self._elements[i] = value     # Returns the array's ierator for transversing the elements.    def __iter__(self):        return _ArrayIterator( self._elements )# An iterator for the Array ADT.class _ArrayIterator:    def __init__(self, theArray):        self._arrayRef = theArray        self._curNdx = 0    def __iter__(self):        return self我無法得到所有矩陣條目都初始化為 0 的結(jié)果。第 8 行，在init self._theGrid.clear(0)第 77 行，在 clear row.clear(value) 中AttributeError：“矩陣”對象沒有屬性“清除”我無法用 x = Matrix(2,3) 初始化矩陣。