sjmachin at lexicon.net
Wed Nov 28 21:37:29 CET 2007
On Nov 29, 7:07 am, "Gianmaria Iaculo - NVENTA"
<gianma... at hotmail.com> wrote:
> Hi there,
> I'm so new to python (coming from .net so excuse me for the stupid question)
> and i'm tring to do a very simple thing,with bytes.
> My problem is this:
> i've a byte that naturally is composed from 2 nibbles hi&low, and two
> chars.. like A nd B. What i wonna do is to write A to the High nibble and B
> to the the lower nibble.
But a nibble is 4 bits and a char in general is 8 bits. Please explain
"write A to the high nibble". Let's assume that you mean that 0 <= A
<= 15 ....
The building blocks that you need are the ord() and chr() builtin
functions, and the << (shift-left) operator. The hex() function is
useful for seeing what is happening.
>>> a = '\x07'
>>> b = '\x08'
>>> c = 7
>>> d = 8
>>> hex(c << 4)
>>> hex((ord(a) << 4) + ord(b))
>>> hex((c << 4) + d)
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