Mark Dickinson <dicki...@gmail.com> added the comment:

> Z/1Z is a perfectly-well-defined ring.

More to the point, it's a perfectly well-defined ring in which every element is 
invertible. That's why the Euler phi function has phi(1) = 1 (rather than 
phi(1) = 0), for example.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37893>
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