Python去除String中的空格/换行/回车等
join:在序列中添加元素
split: 将字符串分解成序列
两者为互逆方法

        s = "as, asdas \r\nasda"    print s.split();#   result: ['as,', 'asdas', 'asda']    print "".join(s.split());#    result: as,asdasasda    l = "".join(s.split()).split(',');    print l;#   result: ['as', 'asdasasda']