用python写无优先级算法代码

以下是一个简单的无优先级算法的 Python 代码示例：

def fcfs(processes):
    """First-Come, First-Served (FCFS) scheduling algorithm"""

    # Sort processes by arrival time
    sorted_processes = sorted(processes, key=lambda p: p.arrival_time)

    # Set start time to the arrival time of the first process
    start_time = sorted_processes[0].arrival_time

    # Initialize the waiting time and turnaround time
    waiting_time = 0
    turnaround_time = 0

    # Loop through the sorted processes
    for i, process in enumerate(sorted_processes):
        # Calculate the waiting time and turnaround time for the current process
        wait = start_time - process.arrival_time
        turnaround = wait + process.burst_time

        # Update the waiting time and turnaround time
        waiting_time += wait
        turnaround_time += turnaround

        # Update the start time for the next process
        start_time += process.burst_time

    # Calculate the average waiting time and turnaround time
    avg_waiting_time = waiting_time / len(processes)
    avg_turnaround_time = turnaround_time / len(processes)

    return avg_waiting_time, avg_turnaround_time

该代码实现了一种简单的先到先服务（FCFS）调度算法。该算法将进程按到达时间进行排序，然后按顺序执行它们。在每个进程执行期间，等待时间和周转时间将被计算，并且将用于计算平均等待时间和平均周转时间。