它用于制作哈希。看：
>grep -Inr SECRET_KEY *conf/global_settings.py:255:SECRET_KEY = ''conf/project_template/settings.py:61:SECRET_KEY = ''contrib/auth/tokens.py:54: hash = sha_constructor(settings.SECRET_KEY + unipre(user.id) +contrib/comments/forms.py:86: info = (content_type, object_pk, timestamp, settings.SECRET_KEY)contrib/formtools/utils.py:15: order, pickles the result with the SECRET_KEY setting, then takes an md5contrib/formtools/utils.py:32: data.append(settings.SECRET_KEY)contrib/messages/storage/cookie.py:112: SECRET_KEY, modified to make it unique for the present purpose.contrib/messages/storage/cookie.py:114: key = 'django.contrib.messages' + settings.SECRET_KEYcontrib/sessions/backends/base.py:89: pickled_md5 = md5_constructor(pickled + settings.SECRET_KEY).hexdigest()contrib/sessions/backends/base.py:95: if md5_constructor(pickled + settings.SECRET_KEY).hexdigest() != tamper_check:contrib/sessions/backends/base.py:134: # Use settings.SECRET_KEY as added salt.contrib/sessions/backends/base.py:143: settings.SECRET_KEY)).hexdigest()contrib/sessions/models.py:16: pickled_md5 = md5_constructor(pickled + settings.SECRET_KEY).hexdigest()contrib/sessions/models.py:59: if md5_constructor(pickled + settings.SECRET_KEY).hexdigest() != tamper_check:core/management/commands/startproject.py:32: # Create a random SECRET_KEY hash, and put it in the main settings.core/management/commands/startproject.py:37: settings_contents = re.sub(r"(?<=SECRET_KEY = ')'", secret_key + "'", settings_contents)middleware/csrf.py:38: % (randrange(0, _MAX_CSRF_KEY), settings.SECRET_KEY)).hexdigest()middleware/csrf.py:41: return md5_constructor(settings.SECRET_KEY + session_id).hexdigest()
