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tokenize only deals with bytes. Users might want to deal with unicode source (for example, if python source is embedded into a document with an already-known encoding).
The naive approach might be something like:
 def my_readline():
 return my_oldreadline().encode('utf-8')
But this doesn't work for python source that declares its encoding, which might be something other than utf-8. The only safe ways are to either manually add a coding line yourself (there are lots of ways, I picked a dumb one):
 def my_readline_safe(was_read=[]):
 if not was_read:
 was_read.append(True)can 
 return b'# coding: utf-8'
 return my_oldreadline().encode('utf-8')
 tokenstream = tokenize.tokenize(my_readline_safe)
Or to use the same my_readline as before (no added coding line), but instead of passing it to tokenize.tokenize, you could pass it to the undocumented _tokenize function:
 tokenstream = tokenize._tokenize(my_readline, 'utf-8')
Or, ideally, you'd just pass the original readline that produces unicode into a utokenize function:
 tokenstream = tokenize.utokenize(my_oldreadline)