auto save

f.py

+import tkinter as tk
+import tkinter.messagebox
+import json
+studentInfos=[]
+root=tk.TK()
+root['height']=200
+root['width']=250
+root.title('学生管理系统')
+choice=tk.IntVar()
+choice.set(1)
+radioAdd=tk.Radiobutton(root,
+                        variable=choice,
+                        value=1
+                        text='添加学生信息')
+radioAdd.place(x=70,y=10)
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