save project

diy2.py

 username = "lyy"
 userpassword = "000"
 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
-    elif name != username:
-        print("用户不存在，请重输")
-    if password != userpassword:
-        print("密码错误，请重输")
+    if i=3
+        name = input("请输入用户名:")
+        password = input("请输入密码:")
+        i-=i
+        if name == username and password == userpassword:
+            print("登录成功!")
+            break
+        elif name != username:
+            print("用户不存在，请重输")
+        if password != userpassword:
+            print("密码错误，请重输")
+    else:
+        print("已锁定")
+        exit
 print("欢迎")