auto save

my_app.py

 import tkinter
 from tkinter import messagebox
-
-with open("user.txt",r,encoding="utf_8") as file:
-
-def login_to_reg():
+import json
+with open("user.txt","r",encoding='utf-8') as file:
+    into=file.read()
+    users=json.loads(into)
+def login_to_reg():    # 登录界面转注册界面
     app_login.root.destroy()
     global app_reg
-    app_reg = My_register()
+    app_reg=My_register()
     app_reg.show()
 
 def reg_to_login():   # 注册界面转登录界面
     app_reg.root.destroy()
     global app_login
-    app_login = My_login()
+    app_login=My_login()
     app_login.show()
 
 def register():     # 注册验证
-    name,password1,password2 = app_reg.get_input()
-    if name == "" or password1=="" or password2=="":
-        messagebox.showwarning("警告","输入框不能为空")
+    name,password1,password2=app_reg.get_input()
+    if name =="" or password1==""  or password2=="":
+        messagebox.showerror("警告","请完善")
     elif name in users:
-        messagebox.showinfo("提示","名")
-    elif password1 != password2:
-        messagebox.showerror("","")
+        messagebox.showerror("警告","已存在")
+    elif password1!=password2:
+        messagebox.showerror("警告","不一致")
+    else:
+        users[name]=password1
     
 
 def login():    # 登录验证