> On Apr 17, 2018, at 11:15 AM, MRAB <pyt...@mrabarnett.plus.com> wrote: > > On 2018-04-17 17:02, Travis Griggs wrote: >> I posted this on SO, but… yeah… >> I'm doing some serial protocol stuff and want to implement a basic byte >> stuffing algorithm in python. Though really what this really generalizes to >> is “what is the most pythonic way to transform one sequence of bytes where >> some bytes are passed through 1:1, but others are transformed to longer >> subsequences of bytes?” I’m pretty sure this rules out the use of >> transform() which expects a 1:1 mapping. > [snip] > There are only 256 possible input bytes, so just put them into a dict and > look them up. > -- > https://mail.python.org/mailman/listinfo/python-list
So something like this? LUT = list(bytes([x]) for x in range(256)) LUT[PacketCode.Escape] = bytes([PacketCode.Escape, PacketCode.Escape ^ 0xFF]) LUT[PacketCode.Start] = bytes([PacketCode.Escape, PacketCode.Start ^ 0xFF]) LUT[PacketCode.Stop] = bytes([PacketCode.Escape, PacketCode.Stop ^ 0xFF]) def stuff6(bits): return b''.join(LUT[x] for x in bits) -- https://mail.python.org/mailman/listinfo/python-list
