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

默认为白空格Whitespace。 
所谓的白空格,一般指的是: 
空格本身,回车\r,换行\n,制表符\t, 换页符\f

(对应于正则表达式中的: \s == [ \r\n\t\f] )

#!/usr/bin/python

str = "     this is string example....wow!!!     ";
print str.rstrip();
str = "88888888this is string example....wow!!!8888888";
print str.rstrip('8');



以上实例输出结果如下:

this is string example....wow!!!
88888888this is string example....wow!!!