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2¡¢multibyte_str.decode("<multibyte_encode_method>")  -> unicode
3¡¢unicode_str.encode("<multibyte_encode_method>")  -> multibyte_str(binary block)
4¡¢unicode_str µÄ²Ù×÷²ÎÊýҲӦΪunicode£¬È磺unicode_str.find("Ñù±¾".decode("utf-8"))
5¡¢´úÂëÀïµÄuǰ׺»á×Ô¶¯Éú³Éunicode×Ö·û´®£¨Ëü¸ú¾ÝÔ´ÂëÊײ¿µÄ#coding:*** ¶ÎÀ´¾ö¶¨Ó¦¸ÃÔõÑùÓÉmultibyteÉú³Éunicode£©
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