def get_file(self):
        file_obj = StringIO(u"Hello world!\n")
        return VirtualFile(file_obj, name='hello-world.txt')
(internal) Mark an object's persistent list for later referral.
dataset/ETHPy150Open benoitbryon/django-downloadview/demo/demoproject/virtual/views.py/StringIODownloadView.get_file--crossover with--dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/spread/jelly.py/_Jellier.preserve