python tkinter编写一个具有保存文件、读取文件功能的简易记事本程序

好的，以下是一个简易的记事本程序：

import tkinter as tk
from tkinter import filedialog

class Notepad:
    def __init__(self, master):
        self.master = master
        self.master.title("记事本")

        # 创建文本框
        self.text = tk.Text(self.master, undo=True)
        self.text.pack(expand=True, fill='both')

        # 创建菜单栏
        self.menu_bar = tk.Menu(self.master)
        self.master.config(menu=self.menu_bar)

        # 文件菜单
        file_menu = tk.Menu(self.menu_bar, tearoff=False)
        file_menu.add_command(label="新建", accelerator="Ctrl+N", command=self.new_file)
        file_menu.add_command(label="打开", accelerator="Ctrl+O", command=self.open_file)
        file_menu.add_command(label="保存", accelerator="Ctrl+S", command=self.save_file)
        file_menu.add_command(label="另存为", accelerator="Ctrl+Shift+S", command=self.save_file_as)
        file_menu.add_separator()
        file_menu.add_command(label="退出", accelerator="Alt+F4", command=self.master.quit)
        self.menu_bar.add_cascade(label="文件", menu=file_menu)

        # 编辑菜单
        edit_menu = tk.Menu(self.menu_bar, tearoff=False)
        edit_menu.add_command(label="撤销", accelerator="Ctrl+Z", command=self.text.edit_undo)
        edit_menu.add_command(label="重做", accelerator="Ctrl+Y", command=self.text.edit_redo)
        edit_menu.add_separator()
        edit_menu.add_command(label="剪切", accelerator="Ctrl+X", command=self.cut)
        edit_menu.add_command(label="复制", accelerator="Ctrl+C", command=self.copy)
        edit_menu.add_command(label="粘贴", accelerator="Ctrl+V", command=self.paste)
        edit_menu.add_separator()
        edit_menu.add_command(label="全选", accelerator="Ctrl+A", command=self.select_all)
        self.menu_bar.add_cascade(label="编辑", menu=edit_menu)

        # 绑定快捷键
        self.master.bind("<Control-n>", lambda event: self.new_file())
        self.master.bind("<Control-o>", lambda event: self.open_file())
        self.master.bind("<Control-s>", lambda event: self.save_file())
        self.master.bind("<Control-S>", lambda event: self.save_file_as())

    def new_file(self):
        self.text.delete(1.0, 'end')

    def open_file(self):
        file = filedialog.askopenfile(mode='r')
        if file is not None:
            content = file.read()
            self.text.delete(1.0, 'end')
            self.text.insert('end', content)
            file.close()

    def save_file(self):
        if not hasattr(self, 'file_path'):
            self.save_file_as()
        else:
            content = self.text.get(1.0, 'end')
            with open(self.file_path, 'w') as file:
                file.write(content)

    def save_file_as(self):
        file = filedialog.asksaveasfile(mode='w', defaultextension=".txt")
        if file is not None:
            content = self.text.get(1.0, 'end')
            file.write(content)
            file.close()
            self.file_path = file.name

    def cut(self):
        self.text.event_generate("<<Cut>>")

    def copy(self):
        self.text.event_generate("<<Copy>>")

    def paste(self):
        self.text.event_generate("<<Paste>>")

    def select_all(self):
        self.text.tag_add('sel', '1.0', 'end')


if __name__ == '__main__':
    root = tk.Tk()
    app = Notepad(root)
    root.mainloop()

这个记事本程序具有保存文件、读取文件的功能。你可以使用文件菜单中的选项或者快捷键来进行操作。同时，你也可以使用编辑菜单中的选项或者快捷键来进行文本编辑。