ó ù¢TQc @s2dZdgZddlmZdZd„ZdS(sN Common checksum routines (used in multiple localflavor/ cases, for example). tluhniÿÿÿÿ(tsixiiiiiiiiii cCs¸t|tjƒs!t|ƒ}ny~tg|ddd…D]}t|ƒ^q;ƒ}tg|ddd…D]}tt|ƒ^qmƒ}||ddkSWntk r³tSXdS(s½ Checks a candidate number for validity according to the Luhn algorithm (used in validation of, for example, credit cards). Both numeric and string candidates are accepted. iÿÿÿÿNiþÿÿÿi i( t isinstanceRt string_typeststrtsumtinttLUHN_ODD_LOOKUPt ValueErrortFalse(t candidatetctevenstodds((s/../Django//lib/python/django/utils/checksums.pyR s26 N( iiiiiiiiii (t__doc__t__all__t django.utilsRRR(((s/../Django//lib/python/django/utils/checksums.pyts