How to port bytes formatting to Python 3.x ?

[Stefan Behnel]

Baptiste Lepilleur, 01.01.2011 10:01:
> Hi,
> I'm trying to port a small library to Python 3.x, and I'm wondering what is
> the best way to port statements such as the one belows that are  frequently
> found in network protocol implementation:
>
>          headerparts = ("%s:%s\n" % (key, value) for key, value in
> headers.iteritems())
>          framebytes = "%s\n%s\n%s\x00" % (command, "".join(headerparts),
> body)
>
> Where all manipulated string are actually bytes, though value in headers
> dict may be any objects.

See my answer in the other thread you started on this topic. You need to 
wrap the literal in a function call that converts it to a bytes literal 
when running in Python 3.

Stefan