error writing str to binary stream - fails in Python 3.0.1, works in 2.x

[Terry Reedy]

wallenpb at gmail.com wrote:

> Thanks for the assist.  One more question, please.
> 
> self.out.write(b'BM') worked beautifully.  Now I also have a similar
> issue, for instance:
> self.out.write("%c" % y) is also giving me the same error as the other
> statement did.
> I tried 

> self.out.write(bytes("%c" %y),encoding=utf-8)

> in an attempt to convert to bytes, which it did, but not binary.

If you actually wrote that, try

self.out.write(bytes("%c" %y,encoding=utf-8))

To aid respondents, copy an paste actually code run and actual result or 
traceback received.

tjr