[issue41905] add update_abstractmethods function to update an ABC's abstract methods

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

> it's totally clear to me what @total_ordering should do 
> -- it should define __le__, __gt__ and __ge__ in terms 
> of __lt__, and leave __lt__ alone, for some subclass to 
> implement.

+1

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<https://bugs.python.org/issue41905>
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