save project

my_app.py

@@ -28,7 +28,7 @@ def register():     # 注册验证
         messagebox.showwarning("错误","两次密码不一样。")
     else:
         users[name] = password1
-        content = json.dump(users)
+        content = json.dumps(users)
         with open("user.txt","w",encoding="utf_8") as file:
             file.write(content)
         messagebox.showinfo("成功","注册成功。")