D:\TracLight\python>python
Python 2.5.1 (r251:54863, Apr 18 2007, 08:51:08) [MSC v.1310 32 bit (Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> fn = os.path.join('./', 'test-file.txt')
>>> open(fn).read()

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
IOError: [Errno 2] No such file or directory: './test-file.txt'

同じディレクトリ下にあるファイルを読むにはどう書けば良いですか？