仿照windows记事本，制作一个记事本软件，实现纯文本文件的新建、打开、保存、另存、复制、粘贴、查找、替换、关于等等功能；关闭软件是弹出对话框提示是否把修改保存，根据用户选择更新磁盘文件内容。

好的，这个任务可以用Python语言和Tkinter库来实现。下面是代码实现：

import tkinter as tk
from tkinter import filedialog, messagebox

class Notepad:
    def __init__(self, master):
        self.master = master
        self.master.title("记事本——by Python")
        self.master.geometry("600x400")

        self.filename = ""
        self.filetext = tk.Text(self.master)
        self.filetext.pack(expand=True, fill=tk.BOTH)

        self.create_menu()

        self.master.protocol("WM_DELETE_WINDOW", self.close_app)

    def create_menu(self):
        menubar = tk.Menu(self.master)
        filemenu = tk.Menu(menubar, tearoff=0)
        filemenu.add_command(label="新建", accelerator="Ctrl+N", command=self.new_file)
        filemenu.add_command(label="打开", accelerator="Ctrl+O", command=self.open_file)
        filemenu.add_command(label="保存", accelerator="Ctrl+S", command=self.save_file)
        filemenu.add_command(label="另存为", accelerator="Ctrl+Shift+S", command=self.save_as_file)
        menubar.add_cascade(label="文件", menu=filemenu)

        editmenu = tk.Menu(menubar, tearoff=0)
        editmenu.add_command(label="复制", accelerator="Ctrl+C", command=self.copy_text)
        editmenu.add_command(label="粘贴", accelerator="Ctrl+V", command=self.paste_text)
        editmenu.add_command(label="查找", accelerator="Ctrl+F", command=self.find_text)
        editmenu.add_command(label="替换", accelerator="Ctrl+H", command=self.replace_text)
        menubar.add_cascade(label="编辑", menu=editmenu)

        helpmenu = tk.Menu(menubar, tearoff=0)
        helpmenu.add_command(label="关于", command=self.about_app)
        menubar.add_cascade(label="帮助", menu=helpmenu)

        self.master.config(menu=menubar)

    def new_file(self, event=None):
        self.filetext.delete("1.0", tk.END)
        self.filename = ""

    def open_file(self, event=None):
        self.filename = filedialog.askopenfilename(defaultextension=".txt", filetypes=[("Text Documents", "*.txt")])
        if self.filename:
            with open(self.filename, "r") as f:
                self.filetext.delete("1.0", tk.END)
                self.filetext.insert(tk.END, f.read())

    def save_file(self, event=None):
        if not self.filename:
            self.filename = filedialog.asksaveasfilename(defaultextension=".txt", filetypes=[("Text Documents", "*.txt")])
        if self.filename:
            with open(self.filename, "w") as f:
                f.write(self.filetext.get("1.0", tk.END))

    def save_as_file(self, event=None):
        self.filename = filedialog.asksaveasfilename(defaultextension=".txt", filetypes=[("Text Documents", "*.txt")])
        if self.filename:
            with open(self.filename, "w") as f:
                f.write(self.filetext.get("1.0", tk.END))

    def copy_text(self, event=None):
        self.filetext.event_generate("<<Copy>>")

    def paste_text(self, event=None):
        self.filetext.event_generate("<<Paste>>")

    def find_text(self, event=None):
        find_window = tk.Toplevel(self.master)
        find_window.title("查找")
        find_window.geometry("300x100")
        find_label = tk.Label(find_window, text="查找内容:")
        find_label.pack(side=tk.LEFT)
        find_entry = tk.Entry(find_window, width=30)
        find_entry.pack(side=tk.LEFT)
        find_entry.focus_set()
        def find():
            text = find_entry.get()
            if text:
                start_pos = self.filetext.search(text, "1.0", stopindex=tk.END)
                if start_pos:
                    end_pos = f"{start_pos}+{len(text)}c"
                    self.filetext.tag_remove(tk.SEL, "1.0", tk.END)
                    self.filetext.tag_add(tk.SEL, start_pos, end_pos)
                    self.filetext.mark_set(tk.INSERT, end_pos)
                    self.filetext.see(tk.INSERT)
                    find_window.destroy()
                else:
                    messagebox.showinfo("查找", "未找到指定内容！")
        find_button = tk.Button(find_window, text="查找", command=find)
        find_button.pack(side=tk.LEFT)

    def replace_text(self, event=None):
        replace_window = tk.Toplevel(self.master)
        replace_window.title("替换")
        replace_window.geometry("300x150")
        find_label = tk.Label(replace_window, text="查找内容:")
        find_label.pack(side=tk.TOP)
        find_entry = tk.Entry(replace_window, width=30)
        find_entry.pack(side=tk.TOP)
        find_entry.focus_set()
        replace_label = tk.Label(replace_window, text="替换为:")
        replace_label.pack(side=tk.TOP)
        replace_entry = tk.Entry(replace_window, width=30)
        replace_entry.pack(side=tk.TOP)
        def replace():
            find_text = find_entry.get()
            replace_text = replace_entry.get()
            if find_text and replace_text:
                start_pos = self.filetext.search(find_text, "1.0", stopindex=tk.END)
                if start_pos:
                    end_pos = f"{start_pos}+{len(find_text)}c"
                    self.filetext.tag_remove(tk.SEL, "1.0", tk.END)
                    self.filetext.tag_add(tk.SEL, start_pos, end_pos)
                    self.filetext.replace(tk.SEL_FIRST, tk.SEL_LAST, replace_text)
                    self.filetext.mark_set(tk.INSERT, start_pos)
                    self.filetext.see(tk.INSERT)
                else:
                    messagebox.showinfo("替换", "未找到指定内容！")
        replace_button = tk.Button(replace_window, text="替换", command=replace)
        replace_button.pack(side=tk.TOP)

    def about_app(self):
        messagebox.showinfo("关于", "记事本——by Python")

    def close_app(self):
        if self.filetext.edit_modified():
            answer = messagebox.askyesnocancel("退出", "是否保存文件？")
            if answer:
                self.save_file()
            elif answer is None:
                return
        self.master.destroy()

if __name__ == "__main__":
    root = tk.Tk()
    notepad = Notepad(root)
    root.mainloop()

这个记事本软件可以通过菜单或快捷键来操作各种功能，关闭软件时如果有修改过的内容会弹出对话框提示是否保存。还可以查找、替换文本内容。