busio/UART: Correct and clarify readline() return.

Surely readline() "rtype" is string not int as stated (and not bytes as some might expect).

Also it is not totally unambiguous what happens on a timeout so it would help to clarify in docs that on a timeout 
it does NOT return with what it has read so far, rather it leaves all that in the buffer ready for a future read and returns nothing.

Likewise clarify that if timeout=0 but there is no newline it DOES return what it has read so far (NOT None). 

At least this is what I think it does and/or is supposed to do!

Python docs are generally not too explicit about what is the proper treatment, so perhaps all the more reason to
clarify the interpretation adopted?

0 files changed, 0 insertions, 0 deletions