[Tutor] Concatenating numeric data in Python 3.3

[Rob Day]

So, for example, you'd be trying to concatenate the binary data
01010101 and 10101010, and get 0101010110101010? You can do that by
shifting the bits:

>>> (0b01010101 << 8) + 0b10101010
21930

which is equivalent to:

>>> 0b0101010110101010
21930

You can also do it with numerical data:

>>> 0b10101010
170
>>> 0b01010101
85
>>> (85 << 8) + 170
21930
>>> "{:b}".format((85 << 8) + 170)
'101010110101010'


On 24 April 2013 17:52, sparkle Plenty <sparkle.plenty12481632 at gmail.com> wrote:
> What is the best way to concatenate packed numeric data?  I am building a
> message to send to a device and it has a very specific header format and
> variable length payload.  Converting to string, concatenating, and then
> converting back to numeric introduced errors.  The tuple() function also
> introduced errors.
>
> The code is proprietary so I am not comfortable posting it.  I have been
> programming in Python for a few weeks.  It is my first OOP language.  My
> background, in the dim and distant past, is mainframe.
>
> Any help would be greatly appreciated.  Thank you in advance.
>
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-- 
Robert K. Day
robert.day at merton.oxon.org