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ljust(width[, fillchar]),
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zfill(width),
expandtabs([tabsize])
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fillchar ²ÎÊýÖ¸¶¨ÁËÓÃÒÔÌî³äµÄ×Ö·û£¬Ä¬ÈÏΪ¿Õ¸ñ
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lstrip([chars]),
rstrip([chars])
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lower(),
upper(),
capitalize(),
swapcase(),
title()
title()º¯ÊýÊDZȽÏÌØ±ðµÄ£¬ËüµÄ¹¦ÄÜÊǽ«Ã¿Ò»¸öµ¥´ÊµÄÊ××Öĸ´óд£¬²¢½«µ¥´ÊÖеķÇÊ××Öĸת»»ÎªÐ¡Ð´£¨Ó¢ÎÄÎÄÕµıêÌâͨ³£ÊÇÕâÖÖ¸ñʽ£©¡£
>>> 'hello wORld!'.title()
'Hello World!'
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>>> ' hello   world!'.title()
' Hello   World!'
>>> string.capwords(' hello   world!')
'Hello World!'
 
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partition(sep),
rpartition(sep),
splitlines([keepends]),
split([sep [,maxsplit]]),
rsplit([sep[,maxsplit]])
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s.split() ºÍ s.split(‘ ‘)µÄ·µ»ØÖµ²»¾¡Ïàͬ
>>> ' hello   world!'.split()
['hello', 'world!']
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