save project

从.py

+username="hh"
+username="hh"
+userpassword="114514"
+while True:
+    name=input("请输入用户名")
+    password =input("请输入密码")
+    if name==username and password ==userpassword:
+        print("登陆成功")
+        break
+    elif name!=username:
+        print("用户名错误，请重新输入。")        
+    else:
+        password!=userpassword:
+         print("密码错误，请重新输入。")
+ print("欢迎来到bilibili")      
\ No newline at end of file