银行家算法python

银行家算法是一种资源分配算法，用于避免系统资源过度分配和死锁的发生。以下是一个简单的Python实现。

def banker_algorithm(available, maximum, allocation):
    # 计算需要的资源
    need = []
    for i in range(len(maximum)):
        need.append([maximum[i][j] - allocation[i][j] for j in range(len(maximum[i]))])
        
    # 初始化状态和安全序列
    work = available
    finish = [False] * len(allocation)
    safety_sequence = []
    
    # 查找可分配的进程
    while False in finish:
        found = False
        for i in range(len(allocation)):
            if not finish[i] and all([need[i][j] <= work[j] for j in range(len(available))]):
                work = [work[j] + allocation[i][j] for j in range(len(available))]
                finish[i] = True
                safety_sequence.append(i)
                found = True
        if not found:
            return "Unsafe state"
    
    return safety_sequence

其中，`available`是可用资源列表，`maximum`是最大需求资源列表，`allocation`是已分配资源列表。返回值是安全序列，如果没有安全序列则返回"Unsafe state"。