输出一份银行家算法的代码

好的，以下是银行家算法的 Python 代码实现：

# 安全序列计算函数
def calculate_safe_sequence(available: list, allocation: list, need: list, process_num: int):
    work = available.copy()
    finish = [False] * process_num
    safe_sequence = []
    while True:
        # 寻找满足条件的进程
        can_execute = False
        for i in range(process_num):
            if not finish[i] and all(need[i][j] <= work[j] for j in range(len(available))):
                can_execute = True
                break
        if not can_execute:
            return None  # 无法获得安全序列
        else:
            safe_sequence.append(i)  # 将该进程加入安全序列
            finish[i] = True
            for j in range(len(available)):
                work[j] += allocation[i][j]

            if all(finish):
                return safe_sequence

# 银行家算法主函数
def banker_alg(available: list, max_need: list, allocation: list):
    process_num = len(max_need)
    need = [[max_need[i][j] - allocation[i][j] for j in range(len(available))] for i in range(process_num)]
    safe_sequence = calculate_safe_sequence(available, allocation, need, process_num)
    if safe_sequence is None:
        return "无法获得安全序列，当前状态不安全"
    else:
        return "安全序列为：" + " -> ".join([f"P{i}" for i in safe_sequence])

# 测试代码
if __name__ == '__main__':
    available = [3, 3, 2]
    max_need = [[7, 5, 3], [3, 2, 2], [9, 0, 2], [2, 2, 2], [4, 3, 3]]
    allocation = [[0, 1, 0], [2, 0, 0], [3, 0, 2], [2, 1, 1], [0, 0, 2]]
    result = banker_alg(available, max_need, allocation)
    print(result)

希望这可以回答您的问题。请问还有什么可以帮助您的吗？