Python-Python 3.1似乎无法处理UTF-16编码的文件？

for subdir, dirs, files in os.walk(rootdir):
for file in files:
    if \'.txt\' in file:
        f = open(subdir+\'/\'+file, \'r\')
        line = f.readline()
        while line:
            line2 = line.split()
            if line2:
                output_file.write(\" \".join(line2)+\'\\n\')
            line = f.readline()
        f.close()

open(bla, \'r\', encoding=\"utf-16\")

Python 3.2 (r32:88452, Feb 20 2011, 11:12:31) 
[GCC 4.2.1 (Apple Inc. build 5664)] on darwin
Type \"help\", \"copyright\", \"credits\" or \"license\" for more information.
>>> a = \'a\'.encode(\'utf-16\')
>>> a
b\'\\xff\\xfea\\x00\'
>>> a.decode(\'utf-16\')
\'a\'
>>> a = \'a\'.encode(\'utf-16-le\')
>>> a
b\'a\\x00\'
>>> a.decode(\'utf-16-le\')
\'a\'
>>> a = \'a\'.encode(\'utf-16-be\')
>>> a
b\'\\x00a\'
>>> a.decode(\'utf-16-be\')
\'a\'