python运算符@重载

638 2023-03-19 16:45

class Matrix:
    def __init__(self, matrix):
        self.values = matrix

    def __matmul__(self, other):
        a = self.values
        b = other.values
        return [
            [
                sum([float(i) * float(j) for i, j in zip(row, col)])
                for col in zip(*b)
            ]
            for row in a
        ]


A = [[1,2,3],[4,5,6]]
B = [[1,1], [1,1], [1,1]]
print(Matrix(A) @ Matrix(B))

#Output:
# [[6.0, 6.0], [15.0, 15.0]]

#Example 3
class Mat(list):
    def __matmul__(self, B):
        A = self
        return Mat([[sum(A[i][k]*B[k][j] for k in range(len(B)))
                    for j in range(len(B[0])) ] for i in range(len(A))])
A = Mat([[1,3],[7,5]])
B = Mat([[6,8],[4,2]])
print(A @ B)

#Output:
# [[18, 14], [62, 66]]

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