save project

diy1.py

 username = "python"
 userpassword = "123456"
-a=input("用户账号:")
-b=input("账号密码:")
-if a==username and b==userpassword:
-    print("登陆成功！")
-else:
-    print("密码错误")
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+while True:
+    a=input("用户账号:")
+    b=input("账号密码:")
+    if a==username and b==userpassword:
+        print("登陆成功！")
+        break
+    else:
+        print("密码错误！请重新输入：")
+print("欢迎来到贝尔编程！")
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