How to iterate through maildir messages in python 3?

Thu Jun 24 15:06:09 EDT 2021

In python 2 one can do:-
 for msg in maildir: 
 print msg # or whatever you want to do with the message
However in python 3 this produces "TypeError: string argument
expected, got 'bytes'".
How should one iterate over a maildir in python3?
(I've been here before but this problem is subtly different from the
one I had before and I can't find the answer)
-- 
Chris Green
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