django matching query does not exist.

matching query does not exist.

刚开始的代码是这样的，group表在数据库中是空的

<pre name="code" class="python">email = 'example@163.com'
name = 'develop'

if not Group.objects.get(email=email):
group = Group()
group.name = name
group.email = email
group.save()

这样执行代码后，一直报错 matching query does not exist. 查了一下官方文档，是使用get函数引起的错误。使用get方法时，当找不到匹配的query时，就会报DoesNotExist exception.代码这样改一下就可以了：

email = 'example@163.com'
name = 'develop'
try:
Group.objects.get(email=email):
except Group.DoesNotExist:
group = Group()
group.name = name
group.email = email
group.save()