save project

diy2.py

+username = "yuanxi"
+userpassword = "20090514"
+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("竟然把用户名写错了")              
+    else:
+        print("你又把密码写错了") 
+print("欢迎来到贝尔编程!")
+