save project

diy2.py

 username = 'python'
 userpassword = "123456"
-
-a=input('输入账号:')
-b=input('输入密码:')
-
-if username==a and userpassword==b:
-    input("登录成功:")
-    
\ No newline at end of file
+while True:
+    a=input('输入账号:')
+    b=input('输入密码:')
+    if username==a and userpassword==b:
+        input("登录成功:")
+        break
+    print("用户名或密码错误!请重新输入")
+print("欢迎来到贝尔编程！")
\ No newline at end of file