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==strip lstrip rstrip使用方法==
<pre>
Python中的strip用于去除字符串的首尾字符，同理，lstrip用于去除左边的字符，rstrip用于去除右边的字符。
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.



这三个函数都可传入一个参数，指定要去除的首尾字符。

需要注意的是，传入的是一个字符数组，编译器去除两端所有相应的字符，直到没有匹配的字符，比如：

theString = 'saaaay yes no yaaaass'
print theString.strip('say')
theString依次被去除首尾在['s'，'a'，'y']数组内的字符，直到字符在不数组内。所以，输出的结果为： 
yes no 
比较简单吧，lstrip和rstrip原理是一样的。

注意：当没有传入参数时，是默认去除首尾空格的。 

theString = 'saaaay yes no yaaaass'
print theString.strip('say') 
print theString.strip('say ') #say后面有空格 
print theString.lstrip('say') 
print theString.rstrip('say') 
运行结果： 

yes no 
es no 
yes no yaaaass 
saaaay yes no

</pre>

==参考==
https://docs.python.org/2/library/stdtypes.html?highlight=strip#str.strip
https://docs.python.org/2/library/string.html?highlight=strip#string.strip


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