Python中如何将数据存储为json格式的文件(续)

 1 import json
 2 
 3 filename = "favorite_fruit.json"
 4 
 5 def greet_user():
 6     """问候用户，并指出他喜欢的水果"""
 7     fruit = get_saved_fruit()
 8     if fruit:
 9         print("I know your favorite fruit !  It‘s " + fruit)
10     else:
11         fruit = save_user_new_fruit()
12         print("I know your favorite fruit !  It‘s " + fruit)
13 
14 
15     
16 
17 def save_user_new_fruit():
18     """提示用户输入喜欢的水果"""
19     fruit = input(" What is your favorite fruit ? ")
20     with open(filename,‘w‘) as  file_obj:
21         json.dump(file_obj,fruit)
22     return fruit
23 
24 def get_saved_fruit():
25     """如果存储了用户喜欢的水果，就获取它"""
26     try :
27         with open(filename) as  file_obj:
28             fruit = json.load(file_obj)
29     except FileNotFoundError:
30         return None
31     else:
32         return fruit
33         
34 greet_user()