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    * S.swapcase()   #´óСд»¥»»
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    * String.capwords(S)
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    * S.ljust(width,[fillchar])
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    * S.rjust(width,[fillchar])    #ÓÒ¶ÔÆë
    * S.center(width, [fillchar])    #Öмä¶ÔÆë
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    * S.find(substr, [start, [end]])
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    * S.index(substr, [start, [end]])
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    * S.rfind(substr, [start, [end]])
      #·µ»ØSÖÐ×îºó³öÏÖµÄsubstrµÄµÚÒ»¸ö×ÖĸµÄ±êºÅ£¬Èç¹ûSÖÐûÓÐsubstrÔò·µ»Ø-1£¬Ò²¾ÍÊÇ˵´ÓÓÒ±ßËãÆðµÄµÚÒ»´Î³öÏÖµÄsubstrµÄÊ××Öĸ±êºÅ
    * S.rindex(substr, [start, [end]])
    * S.count(substr, [start, [end]])    #¼ÆËãsubstrÔÚSÖгöÏֵĴÎÊý
    * S.replace(oldstr, newstr, [count])  
      #°ÑSÖеÄoldstarÌæ»»Îªnewstr£¬countÎªÌæ»»´ÎÊý¡£ÕâÊÇÌæ»»µÄͨÓÃÐÎʽ£¬»¹ÓÐһЩº¯Êý½øÐÐÌØÊâ×Ö·ûµÄÌæ»»
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import ctypes
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