save project

diy1.py

 username = "python"    
 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:
-    print("登录成功")
-else:
-    print("用户名或密码错误")
+userpassword = "123456" 
+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
+    print("用户名和密码错误！请重新输入")
+print("欢迎来到贝尔编程")