save project

nbn.py

+username = "python"
+userpassword = "123456"
+while True:
+    nane = 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
+    if name !=username:
+        print("用户名错误")
+    if password !=userpassword:
+        print("密码错误")
+    
+print("欢迎来到贝尔编程")    
+