auto save

diy2.py

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