python文件的打开，保存图形化操作

import easygui as g
import os

file_path=g.fileopenbox(default='*.txt')

with open(file_path) as old_file:
    title=os.path.basename(file_path)
    msg='文件【%s】的内容如下：'%title
    text=old_file.read()
    text1=g.textbox(msg,title,text)
if text1!=text[:-1]:
    msg='检测到文件内容发生改变，请选择以下操作：'
    tilte='警告'
    choise=g.buttonbox(msg,title,choices=('保存','放弃保存','另保存...'))
    if choise=='保存':
        with open(file_path,'w') as old_file:
            old_file.write(text1[:-1])
    if choise=='放弃保存':
        pass
    if choise=='另保存...':
        another_path=g.filesavebox(default='*.txt')
        if os.path.splitext(another_path)[1]!='.txt':
            another_path+='.txt'
        with open(another_path,'w') as new_file:
            new_file.write(text1[:-1])