Book1_Ch07 代码21 h段代码下面 缺少结束时间计时

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Book1_Ch07 代码21 h段代码下面 缺少结束时间计时

start_time = time.time() # 开始时刻
for i in range(len(A)):
    for j in range(len(B[0])):
        for k in range(len(B)):
            C[i][j] += A[i][k] * B[k][j]
stop_time = time.time() # 结束时刻