目的
獲得一個首尾不含多余空格的字符串
方法
可以使用字符串的以下方法處理：
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.
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.
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.
?
具體的效果如下：
In [10]: x='???? Hi,Jack!??????? '
In [11]: print '|',x.lstrip(),'|',x.rstrip(),'|',x.strip(),'|'
| Hi,Jack!???????? |????? Hi,Jack! | Hi,Jack! |
其中提供的參數chars用來刪除特定的符號，注意空格并沒有被移除，例如：
In [12]: x='yxyxyxxxyy Hello xyxyxyy'
In [13]: print x.strip('xy')
?Hello
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