用Python写一个系统实现处理机调度算法，页面置换算法，磁盘调度算法，每个模块至少包括两个算法，把代码写出来

好的，下面是一个示例代码，实现了处理机调度算法、页面置换算法和磁盘调度算法。每个模块包括两个算法。请注意，这些代码仅供参考，您可以根据自己的需求进行修改和扩展。

处理机调度算法：

class Process:
    def __init__(self, pid, arrival_time, burst_time):
        self.pid = pid
        self.arrival_time = arrival_time
        self.burst_time = burst_time

class Scheduler:
    def __init__(self, processes):
        self.processes = processes

    def fcfs(self):
        # 先来先服务算法
        current_time = 0
        waiting_time = 0
        for process in self.processes:
            waiting_time += max(current_time - process.arrival_time, 0)
            current_time += process.burst_time
        return waiting_time / len(self.processes)

    def sjf(self):
        # 短作业优先算法
        current_time = 0
        waiting_time = 0
        queue = sorted(self.processes, key=lambda x: x.burst_time)
        while queue:
            process = queue.pop(0)
            waiting_time += max(current_time - process.arrival_time, 0)
            current_time += process.burst_time
        return waiting_time / len(self.processes)

页面置换算法：

class Page:
    def __init__(self, pid, page_number):
        self.pid = pid
        self.page_number = page_number

class PageReplacement:
    def __init__(self, pages, page_frames):
        self.pages = pages
        self.page_frames = page_frames

    def fifo(self):
        # 先进先出算法
        page_table = {}
        page_queue = []
        page_faults = 0
        for page in self.pages:
            if page.pid not in page_table:
                page_faults += 1
                if len(page_queue) == self.page_frames:
                    removed_page = page_queue.pop(0)
                    del page_table[removed_page.pid]
                page_queue.append(page)
                page_table[page.pid] = page.page_number
        return page_faults

    def lru(self):
        # 最近最少使用算法
        page_table = {}
        page_list = []
        page_faults = 0
        for page in self.pages:
            if page.pid not in page_table:
                page_faults += 1
                if len(page_list) == self.page_frames:
                    removed_page = page_list.pop(0)
                    del page_table[removed_page.pid]
                page_list.append(page)
                page_table[page.pid] = page.page_number
            else:
                page_list.remove(page)
                page_list.append(page)
        return page_faults

磁盘调度算法：

class Request:
    def __init__(self, track_number):
        self.track_number = track_number

class Scheduler:
    def __init__(self, requests, current_track):
        self.requests = requests
        self.current_track = current_track

    def fcfs(self):
        # 先来先服务算法
        current_time = 0
        total_time = 0
        for request in self.requests:
            total_time += abs(current_track - request.track_number)
            current_track = request.track_number
        return total_time

    def sstf(self):
        # 最短寻道时间优先算法
        current_time = 0
        total_time = 0
        while self.requests:
            closest_request = min(self.requests, key=lambda x: abs(current_track - x.track_number))
            total_time += abs(current_track - closest_request.track_number)
            current_track = closest_request.track_number
            self.requests.remove(closest_request)
        return total_time

以上是一个简单的例子，包括了处理机调度算法、页面置换算法和磁盘调度算法。您可以在此基础上进行扩展和修改，以适应您的应用场景。