實現一個簡單的編輯記事本，實現記事本的最基本功能，麻雀雖小五臟俱全

tkinter實現跨平臺的記事本效果圖：

原始碼:

# -*- encoding:utf -*-

from tkinter import *
from tkinter.messagebox import *
from tkinter.filedialog import *
import os

filename=''

# 作者資訊
def author():
    showinfo('作者資訊','本軟體由XXX完成')

# 版權資訊
def about():
    showinfo('版權資訊.Copyright','本軟體版權歸屬為XXX)

# 開啟檔案
def openfile():
     global filename
     filename=askopenfilename(defaultextension='.txt')
     if filename=='':
         filename=None
     else:
         root.title('FileName:'+os.path.basename(filename))
         textPad.delete(1.0,END)
         f=open(filename,'r')
         textPad.insert(1.0,f.read())
         f.close()

# 新建檔案
def newfile():
    global filename
    root.title('未命名檔案')
    filename=None
    textPad.delete(1.0,END)

# 儲存檔案
def savefile():
    global filename
    try:
        f=open(filename,'w')
        msg=textPad.get(1.0,END)
        f.write(msg)
        f.close()
    except:
        saveasfile()

# 另存檔案
def saveasfile():
    f=asksaveasfilename(initialfile='未命名.txt',defaultextension='.txt')
    global filename
    filename=f
    fh=open(f,'w')
    msg=textPad.get(1.0,END)
    fh.write(msg)
    fh.close()
    root.title('FileName:'+os.path.basename(f))

# 剪下檔案
def cutfile():
    textPad.event_generate('<<Cut>>')

# 複製檔案
def copyfile():
    textPad.event_generate('<<Copy>>')

# 貼上檔案
def pastefile():
    textPad.event_generate('<<Paste>>')

# 重做檔案
def redofile():
    textPad.event_generate('<<Redo>>')

# 撤銷檔案
def undofile():
    textPad.event_generate('<<Undo>>')

# 全選檔案
def selectAll():
    textPad.tag_add('sel','1.0',END)

# 查詢
def search():
    topsearch=Toplevel(root)
    topsearch.geometry('300x30+200+250')
    label1=Label(topsearch,text='Find')
    label1.grid(row=0,column=0,padx=5)
    entry1=Entry(topsearch,width=20)
    entry1.grid(row=0,column=1,padx=5)
    button1=Button(topsearch,text='查詢')
    button1.grid(row=0,column=2)

root = Tk()
root.title("記事本")
root.geometry("800x500+100+100")

# 建立選單
menubar=Menu(root)
root.config(menu=menubar)

filemenu=Menu(menubar)
filemenu.add_command(label='新建',accelerator='Ctrl+N',command=newfile)
filemenu.add_command(label='開啟',accelerator='Ctrl+O',command=openfile)
filemenu.add_command(label='儲存',accelerator='Ctrl+S',command=savefile)
filemenu.add_command(label='另存為',accelerator='Ctrl+Shift+S',command=saveasfile)
menubar.add_cascade(label='檔案',menu=filemenu)

editmenu=Menu(menubar)
editmenu.add_command(label='撤銷',accelerator='Ctrl+Z',command=undofile)
editmenu.add_command(label='重做',accelerator='Ct rl+Y',command=redofile)
editmenu.add_separator()
editmenu.add_command(label='剪下',accelerator='Ctrl+X',command=cutfile)
editmenu.add_command(label='複製',accelerator='Ctrl+C',command=copyfile)
editmenu.add_command(label='貼上',accelerator='Ctrl+V',command=pastefile)
editmenu.add_separator()
editmenu.add_command(label='查詢',accelerator='Ctrl+F',command=search)
editmenu.add_command(label='全選',accelerator='Ctrl+A',command=selectAll)
menubar.add_cascade(label='編輯',menu=editmenu)

aboutmenu=Menu(menubar)
aboutmenu.add_command(label='作者',command=author)
aboutmenu.add_command(label='版權',command=about)
menubar.add_cascade(label='關於',menu=aboutmenu)

# 建立按鈕開關
toolbar=Frame(root,height=25,bg='light sea green')
shortButton=Button(toolbar,text='開啟',command=openfile)
shortButton.pack(side=LEFT,padx=5,pady=5)
shortButton=Button(toolbar,text='儲存',command=savefile)
shortButton.pack(side=LEFT)
toolbar.pack(expand=NO,fill=X)

# 建立狀態列
status=Label(root,text='Ln20',bd=1,relief=SUNKEN,anchor=W)
status.pack(side=BOTTOM,fill=X)

# 建立正文編輯區域linenumber&text
lnlabel=Label(root,width=2,bg='antique white')
lnlabel.pack(side=LEFT,fill=Y)

textPad=Text(root,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)

root.mainloop()