creating a hex value

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What about

martin at lijnbaansgracht:~$ python
Python 2.3.5 (#2, May  4 2005, 08:51:39)
[GCC 3.3.5 (Debian 1:3.3.5-12)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> hex(21)
'0x15'
>>>