两种except，一种要导入，一种要写model。主要看个人习惯。
参考URL：
https://blog.csdn.net/dqchouyang/article/details/78246598
一，导入ObjectDoesNotExist
导入from django.core.exceptions import ObjectDoesNotExist，我感觉好点。
import os
import django
from django.core.exceptions import ObjectDoesNotExist
try:
site_item = Site.objects.get(name=site)
except ObjectDoesNotExist as e:
print(e)
二，和model关联DoesNotExist
不导入，但要和model绑定
try:
site_item = Site.objects.get(name=site)
except Site.DoesNotExist as e:
print(e)
随便pick!
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