Andre Roberge <andre.robe...@gmail.com> added the comment:

I am sorry to hear that this bug was closed based on the unproven assumption 
that this would impact teaching material.  I have *never* seen any pedaggical 
material for the turtle module where the instructor wrote "use left() to have 
the turtle turn right, and vice-versa".

I file the original bug report and the code to fix it based on a report on the 
edu-sig mailing list, more than 3 years ago 
https://mail.python.org/pipermail/edu-sig/2015-March/011207.html

This bug makes it pedagogically unwise to set the coordinate system as 
described since a left() instruction makes the turtle turns right, and 
vice-versa. So, no one using the turtle module to teach can currently use this 
type of coordinate choice as it would be too confusing to students.  The 
solution provided would have fixed that.

If that is the final decision, then so be it - and I will advise people to use 
Brython's turtle module instead as it does not have this bug.

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<https://bugs.python.org/issue23660>
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