id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
27150	Wrong File object behavior if file object has no name attribute	Sergei Zh	VIZZARD-X	"[https://docs.djangoproject.com/en/1.10/ref/files/file/#the-file-class django.core.files.base.File] supports file-like objects (synonym to file object in python glossary) and in fact can't rely on additional `name` attribute, but in current implementation of `__bool__` method it does:

{{{
    def __bool__(self):
        return bool(self.name)
}}}

For example, until `tempfile.SpooledTemporaryFile` isn't large enough to have been written to disk, his `name` attribute is `None` and `if` statement will return False.
{{{
import tempfile
from django.core.files.base import File
python_file_like_object = tempfile.SpooledTemporaryFile()
file_obj = File(python_file_like_object)  # name keyword is None by default
if file_object:  # Falsy, because python_file_like_object.name is None
    print(""42"")
}}}
The same behavior with streams (BytesIO, StringIO).
Maybe `__bool__` method should rely on `self.file` attribute to avoid this behavior?"	Cleanup/optimization	closed	File uploads/storage	1.10	Normal	fixed			Ready for checkin	1	0	0	0	0	0