Terry J. Reedy <tjre...@udel.edu> added the comment:
I got the 'within iomenu' part a bit wrong. To open a file to edit,
iomenu.IOBinging('IO').open tells filelist to use IO.loadfile. This reads
bytes 'so that we can handle end-of-line convention ourselves'. (I suspect
that this predates 3.x and might not be needed any more.) IO.loadfile calls
IO._decode which looks for a utf-8 BOM, looks for a coding cookie, tries ascii
(not needed in 3.x), tries utf-8, and asks the user for an encoding, using
iomenu.encoding as the initial value in the query box. This box is deprecated
in the sense that for 3.x, a python file should either be utf-8 or have an
encoding cookie.
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<https://bugs.python.org/issue41152>
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