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ISO calendar algorithm taken from http://www.phys.uu.nl/~vgent/calendar/isocalendar.htm (used with permission) r5r r �4)r�r r'r�r�r.�_IsoCalendarDate)r�r� week1mondayrr r%r r r� isocalendarIs zdate.isocalendarcCs&t|jd�\}}t|||j|jg�fS�N�)r.r�r�r�r�)r��yhi�ylor r rr�gszdate._getstatecCs"|\}}|_|_|d||_dSr&)r�r�r�)r��stringr(r)r r r� __setstatekszdate.__setstatecCs|j|��fSr�r�r�r r rr�oszdate.__reduce__)NN)NNN))r�r�r�r�r�r�� classmethodr�rrrr r�rrdrrr�r�rr r%rfrrbr�r�r�r�r�rr�r�r�r�r�r!r%r�r�r�r r r rrsX "     $       rr*rr�c@s<eZdZdZdZdd�Zdd�Zdd�Zd d �Zd d �Z d S)rz}Abstract base class for time zone info classes. 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