```python
 from django.test import TestCase

Create your tests here.

if name == 'main':
import os

os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'mysite.settings')
import django
django.setup()
from app1.models import UserInfo

useless = UserInfo.objects.values('age').distinct()
# 被删除的数据
for item in useless:
    print(item)

# {'age': 3}
# {'age': 4}
# {'age': 5}
# {'age': 6}
# {'age': 7}

</details>