如何用python做个记事本

from tkinter import *from tkinter.filedialog import *from tkinter.messagebox import *import os
filename = ""

def author():    showinfo(title="作者", message="Python")

def power():    showinfo(title="版权信息", message="课堂练习")

def mynew():    global top, filename, textPad    top.title("未命名文件")    filename = None    textPad.delete(1.0, END)

def myopen():    global filename    filename = askopenfilename(defaultextension=".txt")    if filename == "":        filename = None    else:        top.title("记事本" + os.path.basename(filename))        textPad.delete(1.0, END)        f = open(filename, 'r')        textPad.insert(1.0, f.read())        f.close()

def mysave():    global filename    try:        f = open(filename, 'w')        msg = textPad.get(1.0, 'end')        f.write(msg)        f.close()    except:        mysaveas()

def mysaveas():    global filename    f = asksaveasfilename(initialfile="未命名.txt", defaultextension=".txt")    filename = f    fh = open(f, 'w')    msg = textPad.get(1.0, END)    fh.write(msg)    fh.close()    top.title("记事本 " + os.path.basename(f))

def cut():    global textPad    textPad.event_generate("<<Cut>>")

def copy():    global textPad    textPad.event_generate("<<Copy>>")

def paste():    global textPad    textPad.event_generate("<<Paste>>")

def undo():    global textPad    textPad.event_generate("<<Undo>>")

def redo():    global textPad    textPad.event_generate("<<Redo>>")

def select_all():    global textPad    # textPad.event_generate("<<Cut>>")    textPad.tag_add("sel", "1.0", "end")

def find():    t = Toplevel(top)    t.title("查找")    t.geometry("260x60+200+250")    t.transient(top)    Label(t, text="查找：").grid(row=0, column=0, sticky="e")    v = StringVar()    e = Entry(t, width=20, textvariable=v)    e.grid(row=0, column=1, padx=2, pady=2, sticky="we")    e.focus_set()    c = IntVar()    Checkbutton(t, text="不区分大小写", variable=c).grid(row=1, column=1, sticky='e')    Button(t, text="查找所有", command=lambda: search(v.get(), c.get(),                                                  textPad, t, e)).grid(row=0, column=2, sticky="e" + "w", padx=2,                                                                       pady=2)
    def close_search():        textPad.tag_remove("match", "1.0", END)        t.destroy()
    t.protocol("WM_DELETE_WINDOW", close_search)

def mypopup(event):    # global editmenu    editmenu.tk_popup(event.x_root, event.y_root)

def search(needle, cssnstv, textPad, t, e):    textPad.tag_remove("match", "1.0", END)    count = 0    if needle:        pos = "1.0"        while True:            pos = textPad.search(needle, pos, nocase=cssnstv, stopindex=END)            if not pos:                break            lastpos = pos + str(len(needle))            textPad.tag_add("match", pos, lastpos)            count += 1            pos = lastpos        textPad.tag_config('match', fg='yellow', bg="green")        e.focus_set()        t.title(str(count) + "个被匹配")

top = Tk()top.title("记事本")top.geometry("600x400+100+50")
menubar = Menu(top)
# 文件功能filemenu = Menu(top)filemenu.add_command(label="新建", accelerator="Ctrl+N", command=mynew)filemenu.add_command(label="打开", accelerator="Ctrl+O", command=myopen)filemenu.add_command(label="保存", accelerator="Ctrl+S", command=mysave)filemenu.add_command(label="另存为", accelerator="Ctrl+shift+s", command=mysaveas)menubar.add_cascade(label="文件", menu=filemenu)
# 编辑功能editmenu = Menu(top)editmenu.add_command(label="撤销", accelerator="Ctrl+Z", command=undo)editmenu.add_command(label="重做", accelerator="Ctrl+Y", command=redo)editmenu.add_separator()editmenu.add_command(label="剪切", accelerator="Ctrl+X", command=cut)editmenu.add_command(label="复制", accelerator="Ctrl+C", command=copy)editmenu.add_command(label="粘贴", accelerator="Ctrl+V", command=paste)editmenu.add_separator()editmenu.add_command(label="查找", accelerator="Ctrl+F", command=find)editmenu.add_command(label="全选", accelerator="Ctrl+A", command=select_all)menubar.add_cascade(label="编辑", menu=editmenu)
# 关于 功能aboutmenu = Menu(top)aboutmenu.add_command(label="作者", command=author)aboutmenu.add_command(label="版权", command=power)menubar.add_cascade(label="关于", menu=aboutmenu)
top['menu'] = menubar
# shortcutbar = Frame(top, height=25, bg='light sea green')# shortcutbar.pack(expand=NO, fill=X)# Inlabe = Label(top, width=2, bg='antique white')# Inlabe.pack(side=LEFT, anchor='nw', fill=Y)
textPad = Text(top, undo=True)textPad.pack(expand=YES, fill=BOTH)scroll = Scrollbar(textPad)textPad.config(yscrollcommand=scroll.set)scroll.config(command=textPad.yview)scroll.pack(side=RIGHT, fill=Y)
# 热键绑定textPad.bind("<Control-N>", mynew)textPad.bind("<Control-n>", mynew)textPad.bind("<Control-O>", myopen)textPad.bind("<Control-o>", myopen)textPad.bind("<Control-S>", mysave)textPad.bind("<Control-s>", mysave)textPad.bind("<Control-A>", select_all)textPad.bind("<Control-a>", select_all)textPad.bind("<Control-F>", find)textPad.bind("<Control-f>", find)
textPad.bind("<Button-3>", mypopup)top.mainloop()