[web2py] error in import pyserial

[frankz]

hi all,
I want to import pyserial  package. however, got an import error.  I
tried a really simple module and it imports just fine. I am not sure
which problem is it.

thanks for help!


Controller
=======

def start():
    import sys
    path = "C:\\Documents and Settings\\frank.zhu\\My Documents\
\Downloads\\web2py\\site-packages\\"
    if path not in sys.path:
        sys.path.append(path)
    # kick off the serial driver
    import serial
    # update bus state in the database
    return dict(session.bus)

Error
====

Traceback (most recent call last):
  File "gluon/restricted.py", line 178, in restricted
  File "C:/Documents and Settings/frank.zhu/My Documents/Downloads/
web2py/applications/dms/controllers/default.py", line 82, in <module>
  File "gluon/globals.py", line 96, in <lambda>
  File "C:/Documents and Settings/frank.zhu/My Documents/Downloads/
web2py/applications/dms/controllers/default.py", line 30, in start
  File "C:\Documents and Settings\frank.zhu\My Documents\Downloads
\web2py\site-packages\pyserial-2.5-rc2\serial\__init__.py", line 19,
in <module>
  File "C:\Documents and Settings\frank.zhu\My Documents\Downloads
\web2py\site-packages\pyserial-2.5-rc2\serial\serialwin32.py", line
12, in <module>
  File "C:\Documents and Settings\frank.zhu\My Documents\Downloads
\web2py\site-packages\pyserial-2.5-rc2\serial\win32.py", line 2, in
<module>
ImportError: No module named wintypes