save project

001.py

 username="python"
 userpassword="123456"
-name=input("输入名字")
-password=input("输入密码")
-if name==username and password==userpassword:
-    print("登录成功")
-    
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+while True:
+    name=input("输入名字")
+    password=input("输入密码")
+    if name==username and password==userpassword:
+        print("登录成功")
+        break
+    print("用户名和密码错误，请在输入一遍")
+print("欢迎来到贝尔编程！")
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