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python中rstrip是什么意思_【详解】python中字符串的strip(),lstrip(),rstrip()的含义...

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【解答】


主要是:


string.


lstrip


(


s[,


chars]


)


Return a copy of the string with leading characters removed. If?chars?is omitted or?None, whitespace characters are removed. If given and not?None,?chars?must be a string; the characters in the string will be stripped from the beginning of the string this method is called on.


Changed in version 2.2.3: The?chars?parameter was added. The?chars?parameter cannot be passed in earlier 2.2 versions.


string.


rstrip


(


s[,


chars]


)


Return a copy of the string with trailing characters removed. If?chars?is omitted or?None, whitespace characters are removed. If given and not?None,?chars?must be a string; the characters in the string will be stripped from the end of the string this method is called on.


Changed in version 2.2.3: The?chars?parameter was added. The?chars?parameter cannot be passed in earlier 2.2 versions.


string.


strip


(


s[,


chars]


)


Return a copy of the string with leading and trailing characters removed. If?chars?is omitted or?None, whitespace characters are removed. If given and not?None,?chars?must be a string; the characters in the string will be stripped from the both ends of the string this method is called on.


Changed in version 2.2.3: The?chars?parameter was added. The?chars?parameter cannot be passed in earlier 2.2 versions.


其中很明显的是:


lstrip = left strip =去除(字符串)左边的=stip leading=去除(字符串)开始的


rstrip = right strip =去除(字符串)右边的=strip trailling=去除(字符串)末尾的


strip = stip left and right = 去除(字符串的)左边的和右边的=strip leading and trailing = 去除(字符串)开始的和末尾的


针对strip的详细解释,翻译过来,就是:


对于输入的字符串,去除,开始的,和,末尾的,字符;


所要去除的字符,是你通过参数chars所指定的。


如果不指定该参数,或者为None,


(即形式为:


someStringValue.strip()



someStringValue.strip(None)



someStringValue.strip(chars=None)


)


则默认为白空格Whitespace。


所谓的白空格,一般指的是:


空格本身,回车 ,换行
,制表符 , 换页符f


(对应于正则表达式中的: s == [
f] )


所以,很明显的是:


someString.strip() == someString.lstrip().rstrip()


而关于此处的:


name.contents[0].strip() .lstrip() .rstrip(‘,’)


我觉得是,其多写了个lstrip(),应该改成:


name.contents[0].strip().rstrip(‘,’)


其等价于


name.contents[0].strip(None).rstrip(‘,’)


意思是


对于name.contents[0],


先去除首尾(即头部和尾部)的白空格(空格本身,回车 ,换行
,制表符 , 换页符f )


之后,再去除尾部的逗号’,’


假如,原先字符串是:


经过这么一处理,则很明显,去除首尾的白空格后,再去除尾部的逗号,就变成了:


了。


进一步举例说明:


strip一般用来是去除一个字符的首尾的多余的,不可见的字符(所谓的白空格)。


比如一个字符是:


那么:


这下明白了吧?



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