Strange extra f added to bytes object

[Ned Batchelder]

On 10/6/13 6:47 PM, Robert Jackson wrote:
> I am very new to python so I'll apologize up front if this is some 
> boneheaded thing.  I am using python and pyserial to talk to an 
> embedded pic processor in a piece of scientific equipment.  I 
> sometimes find the when I construct the bytes object to write it adds 
> an extra f to the first byte.
>
> For example if I have b'\x03\x66\x02\x01\xaa\xbb' it evaluates 
> to b'\x03f\x02\x01\xaa\xbb', which doesn't even seem valid.
>
> Can anyone shine some light this?
>
>

b'\x66' == b'f' .   The hex for "f" is 66.  The f isn't inserted, it's 
the second byte of your string.  When Python displays a string, is uses 
the ASCII character if it can, and a hex escape if it can't.  When you 
use a hex value that is a valid ASCII character, it will display the 
character.

--Ned.
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