save project

diy2.py

 username = "python"
 userpassword = "123456"
+
+ x = 0
+    if x >= 3
+        print('用户名或密码错误！')
+        break
 while True:
+    x += 1
     name = input("请输入用户名:")
     password = input("请输入密码:")
     if name == username and password == userpassword:
-       name != username and password != userp     
-
         print("登录成功!")
+        break
+    if name != username:
+        print('用户名错误.')
         continue
-
-    print("用户名和密码错误!请重新输入")
+    if password != userpassword:
+        print('密码错误')
 print("欢迎来到贝尔编程!")
+