Tim Peters <[email protected]> added the comment:
I don't have a problem with the trivial ring - I wasn't being that high-minded
;-) I was testing a different inverse algorithm, and in the absence of errors
checked that
minv(a, m) * a % m == 1
for various a and m >= 0. Of course that failed using pow(a, -1, m) instead
when m=1. Offhand, I couldn't imagine a plausible use case for finding an
inverse mod 1 - and still can't ;-) In abstract algebra, sure - but for
concrete numerical computation? Oh well.
In any case, testing
(minv(a, m) * a - 1) % m == 0
instead appears to work for all non-error cases.
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<https://bugs.python.org/issue37893>
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