def my_view(request): obj = get_object_or_404(MyModel, pk=1) 此示例相当于：
from django.http import Http404
def my_view(request): try: obj = MyModel.objects.get(pk=1) except MyModel.DoesNotExist: raise Http404("No MyModel matches the given query.")
def my_view(request):
obj = get_object_or_404(MyModel, pk=1)
此示例相当于：
from django.http import Http404
def my_view(request):
try:
obj = MyModel.objects.get(pk=1)
except MyModel.DoesNotExist:
raise Http404("No MyModel matches the given query.")