auto save

diy2.py

 username = "python"
 username = "python"
 userpassword = "123456"
 userpassword = "123456"
+i = 0
 while True:
 while True:
-    name = input("请输入用户名:")
-    password = input("请输入密码:")
-    if name == username and password == userpassword:
-        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!")
+    if i > 0
+        name = input("请输入用户名:")
+        password = input("请输入密码:")
+        if name == username and password == userpassword:
+            print("登录成功!")
+            break
+        if name == username and password == userpassword:    
\ No newline at end of file
+        print("用户名和密码错误!请重新输入")
+        i = i + 1
+        if name != username :
+            print("用户名错误!请重新输入") 
+            i = i + 1
+        if password != userpassword:
+            print("用密码错误!请重新输入" ) 
+            i = i + 1  
+print("欢迎来到贝尔编程!")