GeezerVison is showing github.com — behaviour of the modulo operator · Issue #129297 · python/cpython

behaviour of the modulo operator #129297

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The behaviour of the modulo operator should be made consistent across Python and C/C++.

3%2 # this is 1
-3%2 # this can be represented as -1 or 1 depending of the divisor.
# -3%2 is -1 in C/C++.

I don't think so.

Reacted by Stefan

SerpentByte
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type-featureA feature request or enhancementA feature request or enhancement
on Jan 25, 2025
sobolevn commented on Jan 25, 2025
sobolevn
on Jan 25, 2025
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Looks like a duplicate of #75204
ronaldoussoren commented on Jan 25, 2025
ronaldoussoren
on Jan 25, 2025
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The behaviour of the operator is intentional, see the answers in this stack overflow question for a good explanation of the rationale for this choice.
Reacted by Terry Jan Reedy, Petr Viktorin and Wasim
ronaldoussoren
closed this as not planned on Jan 25, 2025
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terryjreedy commented on Jan 26, 2025
terryjreedy
on Jan 26, 2025
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Issue #75204 is not really a duplicate; it is an open proposal to revise the int division programming FAQ, which involves the choice of modulus sign determination. I just opened PR #129313 for it. It needs coredev review.
Reacted by Wasim