在Python中将对象保存到JSON或XML文件中

我创建了tkinter希望保存在JSON或XML文件中的对象(使用小部件),以便我可以在启动后恢复它们.

from Tkinter import *

class Texte:
    def __init__(self, ax, ay, txt):
        self.entry = Entry(root,bd=0,font=("Purisa",int(15)))
        self.entry.insert(0, txt)
        self.x = ax
        self.y = ay 
        self.entry.place(x=self.x,y=self.y)

root = Tk()

a = Texte(10, 20, 'blah')
b = Texte(20, 70, 'blah2')

# here the user will modify the entries' x, y, txt, etc.

L = [a,b]

# here save the list L (containing the Texte objects) into a JSON file or XML so that I can recover them after restart 

root.mainloop()

如何使用JSON或XML保存和恢复这些对象？

(我现在有点迷失http://docs.python.org/2/library/json.html.)