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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)
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* S.title() #Ö»ÓÐÊ××Öĸ´óд£¬ÆäÓàΪСд£¬Ä£¿éÖÐûÓÐÕâ¸ö·½·¨
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* S.ljust(width,[fillchar])
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* 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]])
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* S.index(substr, [start, [end]])
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* S.rfind(substr, [start, [end]])
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* S.rindex(substr, [start, [end]])
* S.count(substr, [start, [end]]) #¼ÆËãsubstrÔÚSÖгöÏֵĴÎÊý
* S.replace(oldstr, newstr, [count])
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* S.strip([char
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