code: def get_template_sources(self, template_name, template_dirs=None):
          
          if ':' not in template_name:
              return []
          app_name, template_name = template_name.split(":", 1)
          template_dir = get_app_template_dir(app_name)
          if template_dir:
              try:
                  from django.template import Origin
                  origin = Origin(
                      name=join(template_dir, template_name),
                      template_name=template_name,
                      loader=self,
                  )
              except (ImportError, TypeError):
                  origin = join(template_dir, template_name)
              return [origin]
          return []
docs: Returns the absolute paths to "template_name" in the specified app.
          If the name does not contain an app name (no colon), an empty list
          is returned.
          The parent FilesystemLoader.load_template_source() will take care
          of the actual loading for us.