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
19683	A minor mistake?	sunsongxp@…	nobody	"https://docs.djangoproject.com/en/1.4/topics/signing/

In this page, which is about signing, enumerates several examples about how to use it. When it comes to that handling Exception, to be specific,

>>> value += 'm'
>>> try:
...    original = signer.unsign(value)
... except signing.BadSignature:
...    print ""Tampering detected!""

I found that these lines failed, the error shows signing.BadSignature is not defined, I tested a while, and then I knew, 

from django.core import signing

is required. The example miss that. I don't know if that count as a mistake. Besides, the information about previous line is so scarce in reference, do I need to check the source code? "	Uncategorized	new	Documentation	1.4	Normal		signing		Unreviewed	0	0	0	0	0	0