[Twisted-Python] Porting twisted.spread.banana to py3

[Jørn Lomax]

I'm a gsoc student working on the buildbot project, porting it to py3. 
Part of this is looking at porting the dependencies buildbot has in 
twisted and try to port them.

twisted.spread is the most used twisted dependency, so I have started 
working on this. I started working on banana.py and I have encountered a 
question. In dataRecieved (banana.py:174). A chunk is added to the 
buffer. On python3, how should the distinction be made between string 
and bytes. Buffer seems to be a string, the chunk seems to be bytes, and 
sometimes opposite.

Any help would be appreciated

regards,
Jørn Lomax