proposal: another file iterator

[Paul Rubin]

I find pretty often that I want to loop through characters in a file:

  while True:
     c = f.read(1)
     if not c: break
     ... 

or sometimes of some other blocksize instead of 1.  It would sure
be easier to say something like:

   for c in f.iterbytes(): ...

or 

   for c in f.iterbytes(blocksize): ...

this isn't anything terribly advanced but just seems like a matter of
having the built-in types keep up with language features.  The current
built-in iterator (for line in file: ...) is useful for text files but
can potentially read strings of unbounded size, so it's inadvisable for
arbitrary files.

Does anyone else like this idea?