save project

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:")
-    i-=1
-    if name == username :
-        if password==userpassword:
-            print("登陆成功！")
+    if name == username and password == userpassword:
+        print("登录成功!")
         break
-        else:
-            print("密码错误！")
-    else:
-        print("用户名不存在！")
+    if name!=username:
+        print("用户名错误，请重新输入！")
+        print("温馨提示，您还有"+str(i)+"次机会！")
+        comtinue
+    if password!=userpassword:
+        print("密码错误，请重新输入！")
+        print("温馨提示，您还有"+str(i)+"次机会！") 
 print("欢迎来到贝尔编程!")
\ No newline at end of file