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Python-String-Function
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    * S.lower()   #Сд
    * S.upper()   #´óд
    * S.swapcase()   #´óСд»¥»»
    * S.capitalize()   #Ê××Öĸ´óд
    * String.capwords(S)
      #ÕâÊÇÄ£¿éÖеķ½·¨¡£Ëü°ÑSÓÃsplit()º¯Êý·Ö¿ª£¬È»ºóÓÃcapitalize()°ÑÊ××Öĸ±ä³É´óд£¬×îºóÓÃjoin()ºÏ²¢µ½Ò»Æð
    * S.title()    #Ö»ÓÐÊ××Öĸ´óд£¬ÆäÓàΪСд£¬Ä£¿éÖÐûÓÐÕâ¸ö·½·¨
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    * S.ljust(width,[fillchar])
      #Êä³öwidth¸ö×Ö·û£¬S×ó¶ÔÆë£¬²»×㲿·ÖÓÃfillcharÌî³ä£¬Ä¬ÈϵÄΪ¿Õ¸ñ¡£
    * S.rjust(width,[fillchar])    #ÓÒ¶ÔÆë
    * S.center(width, [fillchar])    #Öмä¶ÔÆë
    * S.zfill(width)   #°ÑS±ä³Éwidth³¤£¬²¢ÔÚÓÒ¶ÔÆë£¬²»×㲿·ÖÓÃ0²¹×ã
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    * S.find(substr, [start, [end]])
      #·µ»ØSÖгöÏÖsubstrµÄµÚÒ»¸ö×ÖĸµÄ±êºÅ£¬Èç¹ûSÖÐûÓÐsubstrÔò·µ»Ø-1¡£startºÍend×÷ÓþÍÏ൱ÓÚÔÚS[start:end]ÖÐËÑË÷
    * S.index(substr, [start, [end]])
      #Óëfind()Ïàͬ£¬Ö»ÊÇÔÚSÖÐûÓÐsubstrʱ£¬»á·µ»ØÒ»¸öÔËÐÐʱ´íÎó
    * 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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