# documentação Django 2.0.8

# Código fonte para django.contrib.sites.shortcuts

    from django.apps import apps

    def get_current_site(request):
        """
        Check if contrib.sites is installed and return either the current
        ``Site`` object or a ``RequestSite`` object based on the request.
        """
        # Imports are inside the function because its point is to avoid importing
        # the Site models when django.contrib.sites isn't installed.
        if apps.is_installed('django.contrib.sites'):
            from .models import Site
            return Site.objects.get_current(request)
        else:
            from .requests import RequestSite
            return RequestSite(request)