auto save

diy.py

+i=3
 username='python'
 userpassword='498620'
-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！")
+while True:
+    if i>0:
+        name=input("请输入用户名:")
+        password=input("请输入密码:")
+        i-=1
+        if name==username and password==userpassword:
+            print("登录成功！")
+            break
+        if name !=username:
+            print("用户名不存在!请重新输入")
+            continue
+        if password !=userpassword:
+            print("密码输入错误,请重新输入")
+    else:
+        print("已锁定,我们将拨打110!")
+        exit()        
+print("欢迎来到贝尔编程!")    
+