在Python中将对象保存到JSON或XML文件中

Question

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.)

Answer 1

它在文档中提到,使用json.dump.

使用示例:

import json

data = {'a':1, 'b':2}
with open('my_json.txt', 'w') as fp:
    json.dump(data, fp)

在您的情况下,您不能将对象本身转换为json格式.仅保存信息:

data = {'a':(10, 20, 'blah'), 'b':(20, 70, 'blah2')
with open('my_json.txt', 'w') as fp:
     json.dump(data, fp)

当你加载它时:

with open('my_json.txt') as fp:
    data = json.loads(fp)
    a = Texte(*data['a'])
    b = Texte(*data['b'])