Winでは、msvcrtは標準モジュールに getch() があります。

C:\>\python23\python
Python 2.3b1 (#40, Apr 25 2003, 19:06:24) [MSC v.1200 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import msvcrt
>>> msvcrt.getch()
'a'
>>>