[Tutor] how to see a number as two bytes

[shawn bright]

Thanks for all your help on this, gents.
found what works.
shawn

On Mon, Oct 20, 2008 at 6:06 PM, Alan Gauld <alan.gauld at btinternet.com>wrote:

> "shawn bright" <nephish at gmail.com> wrote
>
>  i have a script that needs to send a number as two bytes.
>> how would i be able to see a number expressed as a hi byte and a lo byte?
>>
>
> One way is to use the struct module.
> It has the advantage of allowing selection of big endian(>) or little
> endian(<) representation etc. The H symbol can be used for a short
> integer - ie 2 bytes...
>
> eg
>
>  import struct
>>>> b = struct.pack(">H", 279)
>>>> b
>>>>
>>> '\x01\x17'
>
>> b = struct.pack("<H", 279)
>>>> b
>>>>
>>> '\x17\x01'
>
>>
>>>>
> Note that Python will print bytes with printable representations as
> the character form but the data is still two bytes.
>
> eg
>
>> struct.pack("H", 33)
>>>>
>>> '!\x00'
>
>> chr(33)
>>>>
>>> '!'
>
>
> HTH,
>
> --
> Alan Gauld
> Author of the Learn to Program web site
> http://www.freenetpages.co.uk/hp/alan.gauld
>
>
>
>
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>
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