Bitwise parities instead of byte ?

[DasFancy]

I would like to know whether there's a possibility of having bitwise parities instead of bytes appended in the end. Is it something to do with the assignment of Galois Fields in this particular package ?

For example, I used matlab comm.RSEncoder and there I merely need to put the N, K and prim_poly values and the coder can simply give me a codelength depending upon the N and prim_poly. I am actually skeptical about how to use this very functionality here in python. Can you please give me a short example how to implement proper parameters if I wish to have a RS code (7,3) with each symbol having 3 bits only.