浏览文本文件并进行修改保存

import easygui as g
import os

path = g.fileopenbox(default="*.txt")

with open(path) as old_file:
    title = os.path.basename(path)  #从路径中截取文件名
    msg = "文件%s的内容如下:"%title
    text = old_file.read()
    text_after = g.textbox(msg, title, text)

if text != text_after[:-1]:  #去除返回值的最后一个换行符
    choice = g.buttonbox("检测到文件内容发生改变,请选择以下方式进行操作",
                         "警告",("保存","另存为","取消"))
    if choice == "保存":
        with open(path, "w") as old_file:
            old_file.write(text_after[:-1])
    if choice == "取消":
        pass
    if choice == "另存为":
        path_new = g.filesavebox(default="*.txt")
        if os.path.splitext(path_new)[1] != ".txt":    #取得后缀名
            path_new += ".txt"
        with open(path_new, "w") as new_file:
            new_file.write(text_after[:-1])
print(title)