auto save

diy2.py

+i=3
 username = "python"
 userpassword = "123456"
 while True:
+    if i>0:
+        a=str(i)
+        print("还有"+a+"次机会")
         name = input("请输入用户名:")
         password = input("请输入密码:")
+        i=i-1
         if name == username and password == userpassword:
             print("登录成功!")
-    print("用户名和密码错误!请重新输入")
+            break
+        else:
+            if name != username:
+                print("用户名错误!请重新输入")
+                continue
+            if password != userpassword:
+                print("密码错误!请重新输入")
+    else:
+        print("用户已被冻结！")
 print("欢迎来到贝尔编程!")
\ No newline at end of file