save project

diy2.py

+a = 3
 username = "python"
 userpassword = "123456"
 while True:
+    if a>=1:        
         name = input("请输入用户名:")
         password = input("请输入密码:")
+        a = a-1
         if name == username and password == userpassword:
             print("登录成功!")
+            print("欢迎来到贝尔编程!")
             break
         if name != username:
             print("账号不存在")
             continue
+        print("还有"+str(a)+"次机会")
         if password != userpassword:
             print("密码错误")
-print("欢迎来到贝尔编程!")
\ No newline at end of file
+            print("还有"+str(a)+"次机会")
\ No newline at end of file