Reserving binary Buffer for struct.pack_into() of exact length

[Hans Müller]

Hello,

I need some buffers, which are beeing concatenated an then send via 
the socket() function.
My problem is that create_string_buffer() creates a buffer which ist 
one byte too long (for a \0 char). But when I concatenate some of 
these buffers to a long one to be transfered, the extra byte is 
corrupting the resulting buffer.
Of course I could slice the buffer before being concatended, but
this looks ugly to me.
Is there a way to create a writeable buffer object without the \0 byte ?

Thanks a lot

Hans