python用tkinter实现简易记事本

from tkinter.filedialog import *
from tkinter.colorchooser import *
from tkinter import *

class Application(Frame):
    
    def __init__(self,master=None):
        super().__init__(master)
        self.master=master
        self.textpad = None
        self.pack()
        self.createWidget()

    def createWidget(self):
        #创建主菜单栏
        menubar = Menu(root)

        #创建子菜单栏
        menuFile = Menu(menubar)
        menuEdit = Menu(menubar)
        menuHelp = Menu(menubar)

        #将子菜单加入主菜单栏
        menubar.add_cascade(label="文件(F)", menu=menuFile)
        menubar.add_cascade(label="编辑(E)", menu=menuEdit)
        menubar.add_cascade(label="帮助(H)", menu=menuHelp)

        #文件
        menuFile.add_command(label="新建",accelerator="ctrl+n",command=self.newfile)
        menuFile.add_command(label="打开",accelerator="ctrl+o",command=self.openfile)
        menuFile.add_command(label="保存",accelerator="ctrl+s",command=self.savefile)
        menuFile.add_separator() #添加分割线
        menuFile.add_command(label="退出",accelerator="ctrl+q",command=self.exit)

        #将主菜单栏加到根窗口
        root["menu"] = menubar

        #增加快捷键处理
        root.bind("<Control-n>",lambda event:self.newfile())
        root.bind("<Control-o>",lambda event:self.openfile())
        root.bind("<Control-s>",lambda event:self.savefile())
        root.bind("<Control-q>",lambda event:self.exit())
        

        #文本编辑区
        self.textpad = Text(root,width=62,height=20)
        self.textpad.pack(pady=5)

        #创建上下菜单
        self.contextMenu = Menu(root)
        self.contextMenu.add_command(label="背景颜色",command=self.openAskColor)

        #为右键绑定事件
        root.bind("<Button-3>",self.createContextMenu)

    def newfile(self):
        self.filename = asksaveasfilename(tile="另存为",initialfile="未命名.txt",
                                          filetypes=[("文本文档","*.txt")],
                                          defaultextension=".txt")
        self.savefile()

    def openfile(self):
        self.textpad.delete("1.0","end")
        with askopenfile(title="打开文本文件") as f:
            self.textpad.insert(INSERT,f.read())
            self.filename = f.name

    def savefile(self):
        with open(self.filename,"w",encoding="uft-8") as f:
            c = self,textpad.get(1.0,END)
            f.write(c)

    def exit(self):
        root.quit()

    def openAskColor(self):
        s1 = askcolor(color="red",title="选择背景色")
        self.textpad.config(bg=s1[1])

    def createContextMenu(self,event):
        #菜单在鼠标右键单击的坐标处显示
        self.contextMenu.post(event.x_root,event.y_root)

if __name__=="__main__":
    root = Tk()
    root.geometry("450x300+200+300")
    root.title("记事本")
    app = Application(master=root)
    root.mainloop()

运行结果