These files are in 8859-1 encoding (names in comments, at least): http://svn.python.org/view/python/trunk/Lib/encodings/punycode.py http://svn.python.org/view/python/trunk/Lib/test/test_csv.py http://svn.python.org/view/python/trunk/Tools/i18n/msgfmt.py http://svn.python.org/view/python/trunk/Tools/i18n/pygettext.py If they are not marked as "text/plain; charset=iso-8859-1" I think it's a bug. Either they should be marked, or converted to ascii or utf-8; the coding pseudocomment (directive) should be changed accordingly.
It's certainly ok to convert them to utf-8 (and add the marker anyway).
No, it's not. PEP 8 mandates that non-ASCII code in the Python source code is in Latin-1.