save project

diy1.py

 username = "python"    
-userpassword = "123456"    
-a=input("请输入用户名")
-b=input("请输入用户密码")
-if a==username and b==userpassword:
-    print("密码正确,登陆成功")
-else:
-    print("密码错误,登陆失败")
+userpassword = "123456" 
+while True:   
+    a=input("请输入用户名:")
+    b=input("请输入用户密码:")
+
+    if a==username and b==userpassword:
+        print("密码正确,登陆成功")
+        break
+    else:
+        print("密码错误,登陆失败")
+print("欢迎来到贝尔编程")
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