the problem of import module

[fts2012 at gmail.com]

follow the dive into python
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>>> import sys
>>> sys.path
>>> sys.path.append('E:\achieve\book\diveintopython-pdfzh-cn-5.4b\diveintopythonzh-cn-5.4b\py')
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I append the filepath of <<dive into python>>'s examples into
sys.path,but
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>>> sys.path
['C:\\Python25\\Lib\\idlelib', 'C:\\WINDOWS\\system32\\python25.zip',
'C:\\Python25\\DLLs', 'C:\\Python25\\lib', 'C:\\Python25\\lib\\plat-
win', 'C:\\Python25\\lib\\lib-tk', 'C:\\Python25', 'C:\\Python25\\lib\
\site-packages', 'E:\x07chieve\x08ook\\diveintopython-pdfzh-cn-5.4b\
\diveintopythonzh-cn-5.4b\\py']
>>> import fileinfo#fileinfo is a module in the path

Traceback (most recent call last):
 File "<pyshell#5>", line 1, in <module>
   import fileinfo
ImportError: No module named fileinfo

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Can anyone tell me the reason of the above and how to add  paths to
python path except adding them in the enviroment path.
Thanks.