strip()方法用于移除字符串首尾的指定字符(默认是空格)
比如:
str = "0000000this is string example....wow!!!0000000";
print str.strip( '0' );
结果:this is string example....wow!!!
str = "0000000this is string 0000example....wow!!!0000000";
print str.strip( '0' );
结果:this is string 0000example....wow!!!
只移除首尾,不移除中间的值