[issue35200] Make the half-open range behaviour easier to teach

[Julien Palard]

Julien Palard <julien+python at palard.fr> added the comment:

In one hand I'm OK to enhance the __str__ of range, so I'll change my PR for this.

It will not fix the issue, but let's not break backward compatibility.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35200>
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