auto save

diy2.py

+i=3
 username = "python"
 userpassword = "123456"
 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!")
+    if i>0:
+        i=i-1
+        name = input("请输入用户名:")
+        password = input("请输入密码:")
+        if name !=username:
+            print("用户名输入错误")
+        elif password != userpassword:
+            print("密码输入错误")
+        else:
+            print("登录成功!")
+            break
+        print("您还有"+str(i)+"次机会。")
+    else:
+        print("输入错误，找管理员解锁")
+        exit()
     print("用户名和密码错误!请重新输入")
 print("欢迎来到贝尔编程!")
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