auto save

my_app.py

 import tkinter
+from tkinter import messagebox
+import json
+
+with open('user.txt', 'r', encoding='utf-8')as f:
+    info = f.read()
+    users = json.loads(info)
+
 
 def login_to_reg():    # 登录界面转注册界面
-    pass
+    app_login.root.destroy()
+    global app_reg  # 全局变量
+    app_reg = My_register()
+    app_reg.show()
+
 
 def reg_to_login():   # 注册界面转登录界面
-    pass
+    app_reg.root.destroy()
+    global app_login
+    app_login = My_login()
+    app_login.show()
+
 
 def register():     # 注册验证
-    pass
+    name, password1, password2 = app_reg.get_input()
+    if name == '' or password1 == '' or password2 == '':
+        messagebox.showwarning('警告', '请填写完整信息')
+    elif name in users:
+        messagebox.showerror('错误', '用户名已经存在')
+    elif password1 != password2:
+        messagebox.showerror('错误', '两次密码不一致！')
+    else:
+        users[name] = password1
+        content = json.dumps(users)
+        with open('user.txt', 'w', encoding='utf-8')as file:
+            file.write(content)
+        # 注册成功，跳到登录页面
+        messagebox.showinfo('成功', '注册成功')
+        reg_to_login()
+
 
 def login():    # 登录验证
-    pass    
+    name, password = app_login.get_input()
+    paw = users.get(name)
+    if paw == password:
+        messagebox.showinfo('成功','登录成功')
+    else:
+        messagebox.showerror('错误','账号或密码有误！')
         
 class My_login():       # 登录窗口
     def __init__(self):
@@ -54,6 +89,7 @@ class My_login():       # 登录窗口
         self.password = self.e2.get()
         return self.name, self.password
 
+
 class My_register():        # 注册窗口
     def __init__(self):
         self.root = tkinter.Tk()
@@ -75,7 +111,7 @@ class My_register():        # 注册窗口
 
         # Label文本标签，窗口界面文字：用户名、密码、确认密码
         lab = tkinter.Label(self.root, text='您好！请填写注册信息',
-              font=('宋体', 15),fg="black", width=40, height=2, bg="green")
+                            font=('宋体', 15), fg="black", width=40, height=2, bg="green")
         lab.place(x=0, y=0)
         lab1 = tkinter.Label(self.root, text='用户名：', font=("宋体", 12),
                              fg="black")
@@ -89,7 +125,7 @@ class My_register():        # 注册窗口
 
         # 注册界面的提交、取消按钮
         button1 = tkinter.Button(self.root, text='提交', bg="lightblue",
-                  width=15,command=register)
+                                 width=15, command=register)
         button1.place(x=230, y=250)
         button1 = tkinter.Button(self.root, text='取消', bg="lightgreen",
                                  width=15, command=reg_to_login)
@@ -103,5 +139,6 @@ class My_register():        # 注册窗口
         self.password2 = self.e3.get()
         return self.name, self.password1, self.password2
 
+
 app_login = My_login()
 app_login.show()

user.txt

-{"admin": "123456"}
\ No newline at end of file
+{"admin": "123456", "python": "123"}
\ No newline at end of file