Ñò ¯×ßGc @s"dZdgZdZd „Zd S(sN Common checksum routines (used in multiple localflavor/ cases, for example). tluhniiiiiiiiii c CsÉt|tƒpt|ƒ}nyŽtg}|ddd…D]}|t|ƒq>~ƒ}tg}|ddd…D]}|tt|ƒqx~ƒ}||ddjSWntj otSXdS(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 isinstancet basestringtstrtsumtinttLUHN_ODD_LOOKUPt ValueErrortFalse(t candidatet_[1]tctevenst_[2]todds((s@/usr/local/lib/python2.6/dist-packages/django/utils/checksums.pyR s:>N( iiiiiiiiii (t__doc__t__all__RR(((s@/usr/local/lib/python2.6/dist-packages/django/utils/checksums.pyts