save project

diy1.py

 username = 'prthon'
 username = 'prthon'
 userpassword = '123456'
 userpassword = '123456'
+while True:
 name=input('请输入用户名:')
 name=input('请输入用户名:')
 password=input('请输入密码:')
 password=input('请输入密码:')
 if username==name and password==userpassword:
 if username==name and password==userpassword:
-    print('登录成功!')
-
+        print('登录成功!')
+        break
+    print(用户名和密码错误，请重新输入!))
+print('欢迎来到贝尔编程')