save project

bug.py

 username="python"
 userpassword="123456"
-name=input("请输入用户名")
-password=input("请输入密码")     
-if name==username and password==userpassword:
+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
+    print("用户名密码错误！请重新输入")
+print("欢迎来到贝尔编程")    
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