Mmm, the output format that I want is like: 0001110011111111000000001111111100000000....
I tried your code on Cygwin under Windows 2000, and on Linux, but it prints out ASCII characters.
Aha..I guess I posted too soon.
You might want to take a look at this cookbook entry: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/219300
Defines lambdas to convert integer to binary. The one you probably want is -
>>> bstr = lambda n, l=16: n<0 and binarystr((2L<<l)+n) or n and bstr(n>>1).lstrip('0')+str(n&1) or '0'
>>> bstr(ord('a'))
'1100001'
--Kartic -- http://mail.python.org/mailman/listinfo/python-list
