如何修复 AttributeError：“Matrix”对象没有“clear”属性？

Question

我正在尝试创建一个 Matrix 类。但是，当我创建它时它会给我带来错误。我试图删除 self._theGrid.clear(0) 但矩阵将被初始化为 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)    ....在我创建的模块中。我正在使用以下模块来创建矩阵。# 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我无法得到所有矩阵条目都初始化为 0 的结果。第 8 行，在init self._theGrid.clear(0)第 77 行，在 clear row.clear(value) 中AttributeError：“矩阵”对象没有属性“清除”我无法用 x = Matrix(2,3) 初始化矩阵。

Answer 1

您似乎在这里迭代数组的长度：

...

def clear( self, value ):

    for row in range( self.numRows() ):  # row is 0, 1, 2, ...  

        row.clear( value )               # int has no method or attribute with name "clear" -> error is raised

...

尝试遍历数组：

...

def clear( self, value ):

    for row in self._theRows:

        row.clear( value ) 

...